213081022449 has 27 divisors (see below), whose sum is σ = 310139857209. Its totient is φ = 140974777800.

The previous prime is 213081022381. The next prime is 213081022457. The reversal of 213081022449 is 944220180312.

The square root of 213081022449 is 461607.

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

213081022449 is a `hidden beast` number, since 2 + 1 + 308 + 102 + 244 + 9 = 666.

It is not a de Polignac number, because 213081022449 - 2⁷ = 213081022321 is a prime.

It is a super-2 number, since 2×213081022449² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213081022489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 209107462 + ... + 209108480.

Almost surely, 2^213081022449 is an apocalyptic number.

213081022449 is the 461607-th square number.

213081022449 is the 230804-th centered octagonal number.

It is an amenable number.

213081022449 is a deficient number, since it is larger than the sum of its proper divisors (97058834760).

213081022449 is an frugal number, since it uses more digits than its factorization.

213081022449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

Multiplying 213081022449 by its sum of digits (36), we get a square (7670916808164 = 2769642²).

The spelling of 213081022449 in words is "two hundred thirteen billion, eighty-one million, twenty-two thousand, four hundred forty-nine".