21513262276 has 81 divisors (see below), whose sum is σ = 42471012493. Its totient is φ = 9527943040.

The previous prime is 21513262249. The next prime is 21513262307. The reversal of 21513262276 is 67226231512.

The square root of 21513262276 is 146674.

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., 379080900 + 21134181376 = 19470^2 + 145376^2 .

It is a super-3 number, since 3×21513262276³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 190382796 + ... + 190382908.

Almost surely, 2^21513262276 is an apocalyptic number.

21513262276 is the 146674-th square number.

It is an amenable number.

21513262276 is a deficient number, since it is larger than the sum of its proper divisors (20957750217).

21513262276 is a wasteful number, since it uses less digits than its factorization.

21513262276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 185 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

Adding to 21513262276 its reverse (67226231512), we get a palindrome (88739493788).

The spelling of 21513262276 in words is "twenty-one billion, five hundred thirteen million, two hundred sixty-two thousand, two hundred seventy-six".