121222100000 has 72 divisors (see below), whose sum is σ = 298301165316. Its totient is φ = 48488800000.

The previous prime is 121222099997. The next prime is 121222100029. The reversal of 121222100000 is 1222121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 12224398096 + 108997701904 = 110564^2 + 330148^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506111 + ... + 706110.

Almost surely, 2^121222100000 is an apocalyptic number.

121222100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222100000 is an abundant number, since it is smaller than the sum of its proper divisors (177079065316).

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

121222100000 is an frugal number, since it uses more digits than its factorization.

121222100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212256 (or 1212228 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121222100000 its reverse (1222121), we get a palindrome (121223322121).

The spelling of 121222100000 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred thousand".