121252312100 has 36 divisors (see below), whose sum is σ = 263141988564. Its totient is φ = 48496414080.

The previous prime is 121252312079. The next prime is 121252312109. The reversal of 121252312100 is 1213252121.

It can be written as a sum of positive squares in 6 ways, for example, as 26988575524 + 94263736576 = 164282^2 + 307024^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (121252312109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1153334 + ... + 1254066.

Almost surely, 2^121252312100 is an apocalyptic number.

121252312100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121252312100 is an abundant number, since it is smaller than the sum of its proper divisors (141889676464).

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

121252312100 is a wasteful number, since it uses less digits than its factorization.

121252312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112784 (or 112777 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 121252312100 its reverse (1213252121), we get a palindrome (122465564221).

The spelling of 121252312100 in words is "one hundred twenty-one billion, two hundred fifty-two million, three hundred twelve thousand, one hundred".