121312222400 has 42 divisors (see below), whose sum is σ = 298503891180. Its totient is φ = 48524888320.

The previous prime is 121312222399. The next prime is 121312222429. The reversal of 121312222400 is 4222213121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37908470 + ... + 37911669.

Almost surely, 2^121312222400 is an apocalyptic number.

121312222400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312222400 is an abundant number, since it is smaller than the sum of its proper divisors (177191668780).

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

121312222400 is an equidigital number, since it uses as much as digits as its factorization.

121312222400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75820161 (or 75820146 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 121312222400 its reverse (4222213121), we get a palindrome (125534435521).

The spelling of 121312222400 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred twenty-two thousand, four hundred".