121212122021120 has 72 divisors (see below), whose sum is σ = 312674827304616. Its totient is φ = 44755245047808.

The previous prime is 121212122021093. The next prime is 121212122021191. The reversal of 121212122021120 is 21120221212121.

It can be written as a sum of positive squares in 4 ways, for example, as 6380837665024 + 114831284356096 = 2526032^2 + 10715936^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121212122021092 and 121212122021101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3642174527 + ... + 3642207806.

Almost surely, 2^{121212122021120} is an apocalyptic number.

121212122021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212122021120 is an abundant number, since it is smaller than the sum of its proper divisors (191462705283496).

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

121212122021120 is an equidigital number, since it uses as much as digits as its factorization.

121212122021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7284382367 (or 7284382353 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121212122021120 its reverse (21120221212121), we get a palindrome (142332343233241).

The spelling of 121212122021120 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty".