21522391629 has 32 divisors (see below), whose sum is σ = 30865090176. Its totient is φ = 13292298240.

The previous prime is 21522391619. The next prime is 21522391637. The reversal of 21522391629 is 92619322512.

It is not a de Polignac number, because 21522391629 - 2²⁵ = 21488837197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522391619) 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, 844189 + ... + 869309.

It is an arithmetic number, because the mean of its divisors is an integer number (964534068).

Almost surely, 2^21522391629 is an apocalyptic number.

It is an amenable number.

21522391629 is a deficient number, since it is larger than the sum of its proper divisors (9342698547).

21522391629 is a wasteful number, since it uses less digits than its factorization.

21522391629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25405.

The product of its digits is 116640, while the sum is 42.

The spelling of 21522391629 in words is "twenty-one billion, five hundred twenty-two million, three hundred ninety-one thousand, six hundred twenty-nine".