21910725026464 has 24 divisors (see below), whose sum is σ = 44302597733268. Its totient is φ = 10659271633920.

The previous prime is 21910725026461. The next prime is 21910725026521. The reversal of 21910725026464 is 46462052701912.

It can be written as a sum of positive squares in 2 ways, for example, as 19154102371600 + 2756622654864 = 4376540^2 + 1660308^2 .

It is a super-3 number, since 3×21910725026464³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21910725026461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9252838777 + ... + 9252841144.

Almost surely, 2^{21910725026464} is an apocalyptic number.

It is an amenable number.

21910725026464 is an abundant number, since it is smaller than the sum of its proper divisors (22391872706804).

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

21910725026464 is a wasteful number, since it uses less digits than its factorization.

21910725026464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505679968 (or 18505679960 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 21910725026464 in words is "twenty-one trillion, nine hundred ten billion, seven hundred twenty-five million, twenty-six thousand, four hundred sixty-four".