21374440562500 has 63 divisors (see below), whose sum is σ = 46758518690331. Its totient is φ = 8549313900000.

The previous prime is 21374440562467. The next prime is 21374440562509. The reversal of 21374440562500 is 526504447312.

The square root of 21374440562500 is 4623250.

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

It can be written as a sum of positive squares in 10 ways, for example, as 16068825856836 + 5305614705664 = 4008594^2 + 2303392^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21374440562509) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 1155803254 + ... + 1155821746.

Almost surely, 2^{21374440562500} is an apocalyptic number.

21374440562500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

21374440562500 is the 4623250-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21374440562500

21374440562500 is an abundant number, since it is smaller than the sum of its proper divisors (25384078127831).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21374440562500 is an frugal number, since it uses more digits than its factorization.

21374440562500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37020 (or 18500 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 43.

The spelling of 21374440562500 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred forty million, five hundred sixty-two thousand, five hundred".