121001121020 has 48 divisors (see below), whose sum is σ = 273689633280. Its totient is φ = 44670652416.

The previous prime is 121001120971. The next prime is 121001121049. The reversal of 121001121020 is 20121100121.

It is a junction number, because it is equal to n+sod(n) for n = 121001120992 and 121001121010.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1916069 + ... + 1978211.

It is an arithmetic number, because the mean of its divisors is an integer number (5701867360).

Almost surely, 2^121001121020 is an apocalyptic number.

121001121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121001121020 is an abundant number, since it is smaller than the sum of its proper divisors (152688512260).

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

121001121020 is a wasteful number, since it uses less digits than its factorization.

121001121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69654 (or 69652 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121001121020 its reverse (20121100121), we get a palindrome (141122221141).

The spelling of 121001121020 in words is "one hundred twenty-one billion, one million, one hundred twenty-one thousand, twenty".