31122320101021 has 4 divisors (see below), whose sum is σ = 31122497019100. Its totient is φ = 31122143182944.

The previous prime is 31122320101003. The next prime is 31122320101027. The reversal of 31122320101021 is 12010102322113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 304433580025 + 30817886520996 = 551755^2 + 5551386^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122320101021 - 2¹⁵ = 31122320068253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31122320101021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122320101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88194906 + ... + 88547083.

It is an arithmetic number, because the mean of its divisors is an integer number (7780624254775).

Almost surely, 2^{31122320101021} is an apocalyptic number.

It is an amenable number.

31122320101021 is a deficient number, since it is larger than the sum of its proper divisors (176918079).

31122320101021 is a wasteful number, since it uses less digits than its factorization.

31122320101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176918078.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31122320101021 its reverse (12010102322113), we get a palindrome (43132422423134).

The spelling of 31122320101021 in words is "thirty-one trillion, one hundred twenty-two billion, three hundred twenty million, one hundred one thousand, twenty-one".