31440423432021 has 32 divisors (see below), whose sum is σ = 43845287070720. Its totient is φ = 20002187551104.

The previous prime is 31440423431999. The next prime is 31440423432029. The reversal of 31440423432021 is 12023432404413.

It is not a de Polignac number, because 31440423432021 - 2⁶ = 31440423431957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440423432029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228324690 + ... + 228462348.

It is an arithmetic number, because the mean of its divisors is an integer number (1370165220960).

Almost surely, 2^{31440423432021} is an apocalyptic number.

It is an amenable number.

31440423432021 is a deficient number, since it is larger than the sum of its proper divisors (12404863638699).

31440423432021 is a wasteful number, since it uses less digits than its factorization.

31440423432021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145385.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 31440423432021 its reverse (12023432404413), we get a palindrome (43463855836434).

The spelling of 31440423432021 in words is "thirty-one trillion, four hundred forty billion, four hundred twenty-three million, four hundred thirty-two thousand, twenty-one".