121021000220020 has 12 divisors (see below), whose sum is σ = 254144100462084. Its totient is φ = 48408400088000.

The previous prime is 121021000220017. The next prime is 121021000220027. The reversal of 121021000220020 is 20022000120121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20516605784676 + 100504394435344 = 4529526^2 + 10025188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021000220027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3025525005481 + ... + 3025525005520.

It is an arithmetic number, because the mean of its divisors is an integer number (21178675038507).

Almost surely, 2^{121021000220020} is an apocalyptic number.

121021000220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021000220020 is an abundant number, since it is smaller than the sum of its proper divisors (133123100242064).

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

121021000220020 is a wasteful number, since it uses less digits than its factorization.

121021000220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051050011010 (or 6051050011008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121021000220020 its reverse (20022000120121), we get a palindrome (141043000340141).

The spelling of 121021000220020 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty thousand, twenty".