21235022888856 has 256 divisors, whose sum is σ = 64959584256000. Its totient is φ = 5649326208000.

The previous prime is 21235022888851. The next prime is 21235022888861. The reversal of 21235022888856 is 65888822053212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21235022888851) and next prime (21235022888861).

It is a self number, because there is not a number n which added to its sum of digits gives 21235022888856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235022888851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1695134065 + ... + 1695146591.

It is an arithmetic number, because the mean of its divisors is an integer number (253748376000).

Almost surely, 2^{21235022888856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235022888856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32479792128000).

21235022888856 is an abundant number, since it is smaller than the sum of its proper divisors (43724561367144).

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

21235022888856 is a wasteful number, since it uses less digits than its factorization.

21235022888856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21622 (or 21618 counting only the distinct ones).

The product of its (nonzero) digits is 29491200, while the sum is 60.

The spelling of 21235022888856 in words is "twenty-one trillion, two hundred thirty-five billion, twenty-two million, eight hundred eighty-eight thousand, eight hundred fifty-six".