121021211020020 has 24 divisors (see below), whose sum is σ = 338859390856224. Its totient is φ = 32272322938656.

The previous prime is 121021211020013. The next prime is 121021211020091. The reversal of 121021211020020 is 20020112120121.

It is a super-2 number, since 2×121021211020020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 1008510091774 + ... + 1008510091893.

It is an arithmetic number, because the mean of its divisors is an integer number (14119141285676).

Almost surely, 2^{121021211020020} is an apocalyptic number.

121021211020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021211020020 is an abundant number, since it is smaller than the sum of its proper divisors (217838179836204).

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

121021211020020 is a wasteful number, since it uses less digits than its factorization.

121021211020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017020183679 (or 2017020183677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121021211020020 its reverse (20020112120121), we get a palindrome (141041323140141).

The spelling of 121021211020020 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred eleven million, twenty thousand, twenty".