31221242122020 has 48 divisors (see below), whose sum is σ = 92020503099840. Its totient is φ = 7887471693696.

The previous prime is 31221242121997. The next prime is 31221242122061. The reversal of 31221242122020 is 2022124212213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13693526107 + ... + 13693528386.

It is an arithmetic number, because the mean of its divisors is an integer number (1917093814580).

Almost surely, 2^{31221242122020} is an apocalyptic number.

31221242122020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31221242122020 is an abundant number, since it is smaller than the sum of its proper divisors (60799260977820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221242122020 is a wasteful number, since it uses less digits than its factorization.

31221242122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27387054524 (or 27387054522 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31221242122020 its reverse (2022124212213), we get a palindrome (33243366334233).

The spelling of 31221242122020 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred forty-two million, one hundred twenty-two thousand, twenty".