121202021100 has 144 divisors (see below), whose sum is σ = 360958820768. Its totient is φ = 31376885760.

The previous prime is 121202021089. The next prime is 121202021113. The reversal of 121202021100 is 1120202121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5060754 + ... + 5084646.

Almost surely, 2^121202021100 is an apocalyptic number.

121202021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121202021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180479410384).

121202021100 is an abundant number, since it is smaller than the sum of its proper divisors (239756799668).

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

121202021100 is a wasteful number, since it uses less digits than its factorization.

121202021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24404 (or 24397 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121202021100 its reverse (1120202121), we get a palindrome (122322223221).

It can be divided in two parts, 121202021 and 100, that added together give a palindrome (121202121).

The spelling of 121202021100 in words is "one hundred twenty-one billion, two hundred two million, twenty-one thousand, one hundred".