21699225031 has 64 divisors (see below), whose sum is σ = 26185420800. Its totient is φ = 17781120000.

The previous prime is 21699225007. The next prime is 21699225043. The reversal of 21699225031 is 13052299612.

It is a 10-Lehmer number, since φ(21699225031) divides (21699225031-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 21699225031 - 2⁵ = 21699224999 is a prime.

It is a super-2 number, since 2×21699225031² (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 (21699225071) 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, 44193696 + ... + 44194186.

It is an arithmetic number, because the mean of its divisors is an integer number (409147200).

Almost surely, 2^21699225031 is an apocalyptic number.

21699225031 is the 65878-th centered decagonal number.

21699225031 is a deficient number, since it is larger than the sum of its proper divisors (4486195769).

21699225031 is a wasteful number, since it uses less digits than its factorization.

21699225031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 21699225031 in words is "twenty-one billion, six hundred ninety-nine million, two hundred twenty-five thousand, thirty-one".