121252100000 has 72 divisors (see below), whose sum is σ = 298374988716. Its totient is φ = 48500800000.

The previous prime is 121252099981. The next prime is 121252100003. The reversal of 121252100000 is 1252121.

It can be written as a sum of positive squares in 6 ways, for example, as 17869272976 + 103382827024 = 133676^2 + 321532^2 .

It is not an unprimeable number, because it can be changed into a prime (121252100003) by changing a digit.

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, 506261 + ... + 706260.

Almost surely, 2^121252100000 is an apocalyptic number.

121252100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121252100000 is an abundant number, since it is smaller than the sum of its proper divisors (177122888716).

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

121252100000 is an frugal number, since it uses more digits than its factorization.

121252100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212556 (or 1212528 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 121252100000 its reverse (1252121), we get a palindrome (121253352121).

The spelling of 121252100000 in words is "one hundred twenty-one billion, two hundred fifty-two million, one hundred thousand".