21554904711076 has 243 divisors, whose sum is σ = 45438685896513. Its totient is φ = 8938547513280.

The previous prime is 21554904711073. The next prime is 21554904711089. The reversal of 21554904711076 is 67011740945512.

The square root of 21554904711076 is 4642726.

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., 11302869176676 + 10252035534400 = 3361974^2 + 3201880^2 .

It is a super-2 number, since 2×21554904711076² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21554904711073) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 56279124381 + ... + 56279124763.

Almost surely, 2^{21554904711076} is an apocalyptic number.

21554904711076 is the 4642726-th square number.

It is an amenable number.

21554904711076 is an abundant number, since it is smaller than the sum of its proper divisors (23883781185437).

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

21554904711076 is a wasteful number, since it uses less digits than its factorization.

21554904711076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 21554904711076 in words is "twenty-one trillion, five hundred fifty-four billion, nine hundred four million, seven hundred eleven thousand, seventy-six".