4979989464921 has 27 divisors (see below), whose sum is σ = 7373450496607. Its totient is φ = 3238839011040.

The previous prime is 4979989464913. The next prime is 4979989464929. The reversal of 4979989464921 is 1294649899794.

The square root of 4979989464921 is 2231589.

It is a perfect power (a square), and thus also a powerful number.

4979989464921 is a `hidden beast` number, since 4 + 9 + 7 + 9 + 9 + 89 + 46 + 492 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (4979989464913) and next prime (4979989464929).

It can be written as a sum of positive squares in only one way, i.e., 239963799321 + 4740025665600 = 489861^2 + 2177160^2 .

It is not a de Polignac number, because 4979989464921 - 2³ = 4979989464913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4979989464929) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 274476376 + ... + 274494518.

Almost surely, 2^{4979989464921} is an apocalyptic number.

4979989464921 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

4979989464921 is the 2231589-th square number.

4979989464921 is the 1115795-th centered octagonal number.

It is an amenable number.

4979989464921 is a deficient number, since it is larger than the sum of its proper divisors (2393461031686).

4979989464921 is an frugal number, since it uses more digits than its factorization.

4979989464921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36374 (or 18187 counting only the distinct ones).

The product of its digits is 2539579392, while the sum is 81.

Multiplying 4979989464921 by its sum of digits (81), we get a square (403379146658601 = 20084301²).

The spelling of 4979989464921 in words is "four trillion, nine hundred seventy-nine billion, nine hundred eighty-nine million, four hundred sixty-four thousand, nine hundred twenty-one".