120021312031 has 4 divisors (see below), whose sum is σ = 120156624432. Its totient is φ = 119885999632.

The previous prime is 120021312013. The next prime is 120021312041. The reversal of 120021312031 is 130213120021.

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

It is a cyclic number.

It is not a de Polignac number, because 120021312031 - 2¹³ = 120021303839 is a prime.

It is a super-2 number, since 2×120021312031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021311996 and 120021312014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021312041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67654870 + ... + 67656643.

It is an arithmetic number, because the mean of its divisors is an integer number (30039156108).

Almost surely, 2^120021312031 is an apocalyptic number.

120021312031 is a deficient number, since it is larger than the sum of its proper divisors (135312401).

120021312031 is an equidigital number, since it uses as much as digits as its factorization.

120021312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135312400.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 120021312031 its reverse (130213120021), we get a palindrome (250234432052).

The spelling of 120021312031 in words is "one hundred twenty billion, twenty-one million, three hundred twelve thousand, thirty-one".