121020222100 has 36 divisors (see below), whose sum is σ = 262893165948. Its totient is φ = 48356608000.

The previous prime is 121020222097. The next prime is 121020222131. The reversal of 121020222100 is 1222020121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 497379204 + 120522842896 = 22302^2 + 347164^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 548941 + ... + 737140.

It is an arithmetic number, because the mean of its divisors is an integer number (7302587943).

Almost surely, 2^121020222100 is an apocalyptic number.

121020222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020222100 is an abundant number, since it is smaller than the sum of its proper divisors (141872943848).

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

121020222100 is a wasteful number, since it uses less digits than its factorization.

121020222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287036 (or 1287029 counting only the distinct ones).

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

Adding to 121020222100 its reverse (1222020121), we get a palindrome (122242242221).

The spelling of 121020222100 in words is "one hundred twenty-one billion, twenty million, two hundred twenty-two thousand, one hundred".