31122101021 has 24 divisors (see below), whose sum is σ = 35992071360. Its totient is φ = 26681177600.

The previous prime is 31122101011. The next prime is 31122101027. The reversal of 31122101021 is 12010122113.

It is a de Polignac number, because none of the positive numbers 2^k-31122101021 is a prime.

It is a super-2 number, since 2×31122101021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31122100987 and 31122101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122101027) 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 23 ways as a sum of consecutive naturals, for example, 375485 + ... + 450813.

It is an arithmetic number, because the mean of its divisors is an integer number (1499669640).

Almost surely, 2^31122101021 is an apocalyptic number.

It is an amenable number.

31122101021 is a deficient number, since it is larger than the sum of its proper divisors (4869970339).

31122101021 is a wasteful number, since it uses less digits than its factorization.

31122101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75457 (or 75434 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31122101021 its reverse (12010122113), we get a palindrome (43132223134).

The spelling of 31122101021 in words is "thirty-one billion, one hundred twenty-two million, one hundred one thousand, twenty-one".