21092914756 has 9 divisors (see below), whose sum is σ = 36913109149. Its totient is φ = 10546312144.

The previous prime is 21092914751. The next prime is 21092914813. The reversal of 21092914756 is 65741929012.

The square root of 21092914756 is 145234.

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

It can be written as a sum of positive squares in only one way, i.e., 20796524100 + 296390656 = 144210^2 + 17216^2 .

It is a super-2 number, since 2×21092914756² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21092914751) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 254160 + ... + 326776.

Almost surely, 2^21092914756 is an apocalyptic number.

21092914756 is the 145234-th square number.

It is an amenable number.

21092914756 is a deficient number, since it is larger than the sum of its proper divisors (15820194393).

21092914756 is an frugal number, since it uses more digits than its factorization.

21092914756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145238 (or 72619 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 21092914756 in words is "twenty-one billion, ninety-two million, nine hundred fourteen thousand, seven hundred fifty-six".