121312242020 has 12 divisors (see below), whose sum is σ = 254755708284. Its totient is φ = 48524896800.

The previous prime is 121312241951. The next prime is 121312242043. The reversal of 121312242020 is 20242213121.

It can be written as a sum of positive squares in 2 ways, for example, as 14184333604 + 107127908416 = 119098^2 + 327304^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6065612101 = 121312242020 / (1 + 2 + 1 + 3 + 1 + 2 + 2 + 4 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 121312241983 and 121312242001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3032806031 + ... + 3032806070.

It is an arithmetic number, because the mean of its divisors is an integer number (21229642357).

Almost surely, 2^121312242020 is an apocalyptic number.

121312242020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312242020 is an abundant number, since it is smaller than the sum of its proper divisors (133443466264).

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

121312242020 is a wasteful number, since it uses less digits than its factorization.

121312242020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065612110 (or 6065612108 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 121312242020 its reverse (20242213121), we get a palindrome (141554455141).

The spelling of 121312242020 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred forty-two thousand, twenty".