21100432031 has 16 divisors (see below), whose sum is σ = 24338755584. Its totient is φ = 17918242944.

The previous prime is 21100432021. The next prime is 21100432049. The reversal of 21100432031 is 13023400112.

It is not a de Polignac number, because 21100432031 - 2¹⁰ = 21100431007 is a prime.

It is a super-2 number, since 2×21100432031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100432021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2500886 + ... + 2509308.

It is an arithmetic number, because the mean of its divisors is an integer number (1521172224).

Almost surely, 2^21100432031 is an apocalyptic number.

21100432031 is a deficient number, since it is larger than the sum of its proper divisors (3238323553).

21100432031 is a wasteful number, since it uses less digits than its factorization.

21100432031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11710.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21100432031 its reverse (13023400112), we get a palindrome (34123832143).

The spelling of 21100432031 in words is "twenty-one billion, one hundred million, four hundred thirty-two thousand, thirty-one".