31440202110021 has 32 divisors (see below), whose sum is σ = 42585828894720. Its totient is φ = 20629082073600.

The previous prime is 31440202109977. The next prime is 31440202110029. The reversal of 31440202110021 is 12001120204413.

It is not a de Polignac number, because 31440202110021 - 2⁹ = 31440202109509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31440202110021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440202110029) 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, 248493586 + ... + 248620076.

It is an arithmetic number, because the mean of its divisors is an integer number (1330807152960).

Almost surely, 2^{31440202110021} is an apocalyptic number.

It is an amenable number.

31440202110021 is a deficient number, since it is larger than the sum of its proper divisors (11145626784699).

31440202110021 is a wasteful number, since it uses less digits than its factorization.

31440202110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129897.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31440202110021 its reverse (12001120204413), we get a palindrome (43441322314434).

The spelling of 31440202110021 in words is "thirty-one trillion, four hundred forty billion, two hundred two million, one hundred ten thousand, twenty-one".