31105453821 has 16 divisors (see below), whose sum is σ = 45702947136. Its totient is φ = 18696658176.

The previous prime is 31105453807. The next prime is 31105453823. The reversal of 31105453821 is 12835450113.

It is not a de Polignac number, because 31105453821 - 2⁷ = 31105453693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105453823) 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, 9272460 + ... + 9275813.

It is an arithmetic number, because the mean of its divisors is an integer number (2856434196).

Almost surely, 2^31105453821 is an apocalyptic number.

It is an amenable number.

31105453821 is a deficient number, since it is larger than the sum of its proper divisors (14597493315).

31105453821 is a wasteful number, since it uses less digits than its factorization.

31105453821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18548332.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 31105453821 in words is "thirty-one billion, one hundred five million, four hundred fifty-three thousand, eight hundred twenty-one".