31440202143021 has 30 divisors (see below), whose sum is σ = 54634183473870. Its totient is φ = 17965829793744.

The previous prime is 31440202143011. The next prime is 31440202143059. The reversal of 31440202143021 is 12034120204413.

31440202143021 is a `hidden beast` number, since 3 + 1 + 4 + 4 + 0 + 202 + 1 + 430 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29487995181225 + 1952206961796 = 5430285^2 + 1397214^2 .

It is not a de Polignac number, because 31440202143021 - 2⁷ = 31440202142893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440202143011) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3960716886 + ... + 3960724823.

It is an arithmetic number, because the mean of its divisors is an integer number (1821139449129).

Almost surely, 2^{31440202143021} is an apocalyptic number.

It is an amenable number.

31440202143021 is a deficient number, since it is larger than the sum of its proper divisors (23193981330849).

31440202143021 is an equidigital number, since it uses as much as digits as its factorization.

31440202143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921441735 (or 7921441719 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 31440202143021 its reverse (12034120204413), we get a palindrome (43474322347434).

The spelling of 31440202143021 in words is "thirty-one trillion, four hundred forty billion, two hundred two million, one hundred forty-three thousand, twenty-one".