21022655740 has 12 divisors (see below), whose sum is σ = 44147577096. Its totient is φ = 8409062288.

The previous prime is 21022655723. The next prime is 21022655743. The reversal of 21022655740 is 4755622012.

It is a junction number, because it is equal to n+sod(n) for n = 21022655696 and 21022655705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022655743) 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, 525566374 + ... + 525566413.

It is an arithmetic number, because the mean of its divisors is an integer number (3678964758).

Almost surely, 2^21022655740 is an apocalyptic number.

21022655740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022655740 is an abundant number, since it is smaller than the sum of its proper divisors (23124921356).

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

21022655740 is a wasteful number, since it uses less digits than its factorization.

21022655740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051132796 (or 1051132794 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 21022655740 in words is "twenty-one billion, twenty-two million, six hundred fifty-five thousand, seven hundred forty".