121011021020 has 24 divisors (see below), whose sum is σ = 265171977504. Its totient is φ = 46299868736.

The previous prime is 121011020981. The next prime is 121011021029. The reversal of 121011021020 is 20120110121.

It is a junction number, because it is equal to n+sod(n) for n = 121011020992 and 121011021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011021029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131533259 + ... + 131534178.

It is an arithmetic number, because the mean of its divisors is an integer number (11048832396).

Almost surely, 2^121011021020 is an apocalyptic number.

121011021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011021020 is an abundant number, since it is smaller than the sum of its proper divisors (144160956484).

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

121011021020 is a wasteful number, since it uses less digits than its factorization.

121011021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263067469 (or 263067467 counting only the distinct ones).

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

Adding to 121011021020 its reverse (20120110121), we get a palindrome (141131131141).

The spelling of 121011021020 in words is "one hundred twenty-one billion, eleven million, twenty-one thousand, twenty".