21022888623 has 32 divisors (see below), whose sum is σ = 31535953152. Its totient is φ = 12345177600.

The previous prime is 21022888609. The next prime is 21022888643. The reversal of 21022888623 is 32688822012.

It is not a de Polignac number, because 21022888623 - 2¹² = 21022884527 is a prime.

It is a super-2 number, since 2×21022888623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022888643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258540 + ... + 329982.

It is an arithmetic number, because the mean of its divisors is an integer number (985498536).

Almost surely, 2^21022888623 is an apocalyptic number.

21022888623 is a deficient number, since it is larger than the sum of its proper divisors (10513064529).

21022888623 is a wasteful number, since it uses less digits than its factorization.

21022888623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71735.

The product of its (nonzero) digits is 147456, while the sum is 42.

The spelling of 21022888623 in words is "twenty-one billion, twenty-two million, eight hundred eighty-eight thousand, six hundred twenty-three".