121011200020 has 24 divisors (see below), whose sum is σ = 254321643744. Its totient is φ = 48366742176.

The previous prime is 121011199999. The next prime is 121011200027. The reversal of 121011200020 is 20002110121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011200027) 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, 2332314 + ... + 2383633.

It is an arithmetic number, because the mean of its divisors is an integer number (10596735156).

Almost surely, 2^121011200020 is an apocalyptic number.

121011200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011200020 is an abundant number, since it is smaller than the sum of its proper divisors (133310443724).

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

121011200020 is a wasteful number, since it uses less digits than its factorization.

121011200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717239 (or 4717237 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121011200020 its reverse (20002110121), we get a palindrome (141013310141).

It can be divided in two parts, 12101 and 1200020, that added together give a palindrome (1212121).

The spelling of 121011200020 in words is "one hundred twenty-one billion, eleven million, two hundred thousand, twenty".