21431102031 has 12 divisors (see below), whose sum is σ = 30963775752. Its totient is φ = 14283829296.

The previous prime is 21431102023. The next prime is 21431102039. The reversal of 21431102031 is 13020113412.

21431102031 is a `hidden beast` number, since 21 + 431 + 10 + 203 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21431102023) and next prime (21431102039).

It is not a de Polignac number, because 21431102031 - 2³ = 21431102023 is a prime.

It is a super-2 number, since 2×21431102031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21431101995 and 21431102013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431102039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259416 + ... + 331901.

It is an arithmetic number, because the mean of its divisors is an integer number (2580314646).

Almost surely, 2^21431102031 is an apocalyptic number.

21431102031 is a deficient number, since it is larger than the sum of its proper divisors (9532673721).

21431102031 is a wasteful number, since it uses less digits than its factorization.

21431102031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595350 (or 595347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21431102031 its reverse (13020113412), we get a palindrome (34451215443).

The spelling of 21431102031 in words is "twenty-one billion, four hundred thirty-one million, one hundred two thousand, thirty-one".