121002021220 has 24 divisors (see below), whose sum is σ = 257683180608. Its totient is φ = 47719106400.

The previous prime is 121002021209. The next prime is 121002021223. The reversal of 121002021220 is 22120200121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121002021220.

It is not an unprimeable number, because it can be changed into a prime (121002021223) 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, 42604926 + ... + 42607765.

It is an arithmetic number, because the mean of its divisors is an integer number (10736799192).

Almost surely, 2^121002021220 is an apocalyptic number.

121002021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002021220 is an abundant number, since it is smaller than the sum of its proper divisors (136681159388).

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

121002021220 is a wasteful number, since it uses less digits than its factorization.

121002021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85212771 (or 85212769 counting only the distinct ones).

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

Adding to 121002021220 its reverse (22120200121), we get a palindrome (143122221341).

The spelling of 121002021220 in words is "one hundred twenty-one billion, two million, twenty-one thousand, two hundred twenty".