31401211331021 has 16 divisors (see below), whose sum is σ = 36379808742144. Its totient is φ = 26545813858944.

The previous prime is 31401211330991. The next prime is 31401211331029. The reversal of 31401211331021 is 12013311210413.

It is a cyclic number.

It is not a de Polignac number, because 31401211331021 - 2¹⁴ = 31401211314637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401211331029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16197560 + ... + 18032286.

It is an arithmetic number, because the mean of its divisors is an integer number (2273738046384).

Almost surely, 2^{31401211331021} is an apocalyptic number.

It is an amenable number.

31401211331021 is a deficient number, since it is larger than the sum of its proper divisors (4978597411123).

31401211331021 is a wasteful number, since it uses less digits than its factorization.

31401211331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868300.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31401211331021 its reverse (12013311210413), we get a palindrome (43414522541434).

The spelling of 31401211331021 in words is "thirty-one trillion, four hundred one billion, two hundred eleven million, three hundred thirty-one thousand, twenty-one".