21100202031 has 16 divisors (see below), whose sum is σ = 29741437440. Its totient is φ = 13269240000.

The previous prime is 21100202023. The next prime is 21100202033. The reversal of 21100202031 is 13020200112.

It is not a de Polignac number, because 21100202031 - 2³ = 21100202023 is a prime.

It is a super-2 number, since 2×21100202031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100201998 and 21100202016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100202033) 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, 781095 + ... + 807656.

It is an arithmetic number, because the mean of its divisors is an integer number (1858839840).

Almost surely, 2^21100202031 is an apocalyptic number.

21100202031 is a deficient number, since it is larger than the sum of its proper divisors (8641235409).

21100202031 is a wasteful number, since it uses less digits than its factorization.

21100202031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589006.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21100202031 its reverse (13020200112), we get a palindrome (34120402143).

The spelling of 21100202031 in words is "twenty-one billion, one hundred million, two hundred two thousand, thirty-one".