21890802288658 has 24 divisors (see below), whose sum is σ = 34935613331472. Its totient is φ = 10285532764224.

The previous prime is 21890802288653. The next prime is 21890802288659. The reversal of 21890802288658 is 85688220809812.

It is a super-2 number, since 2×21890802288658² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21890802288593 and 21890802288602.

It is not an unprimeable number, because it can be changed into a prime (21890802288653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29078860 + ... + 29822167.

It is an arithmetic number, because the mean of its divisors is an integer number (1455650555478).

Almost surely, 2^{21890802288658} is an apocalyptic number.

21890802288658 is a deficient number, since it is larger than the sum of its proper divisors (13044811042814).

21890802288658 is a wasteful number, since it uses less digits than its factorization.

21890802288658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58901706 (or 58901689 counting only the distinct ones).

The product of its (nonzero) digits is 70778880, while the sum is 67.

The spelling of 21890802288658 in words is "twenty-one trillion, eight hundred ninety billion, eight hundred two million, two hundred eighty-eight thousand, six hundred fifty-eight".