121457909402 has 16 divisors (see below), whose sum is σ = 193562128872. Its totient is φ = 56961584640.

The previous prime is 121457909401. The next prime is 121457909471. The reversal of 121457909402 is 204909754121.

It can be written as a sum of positive squares in 4 ways, for example, as 120708299761 + 749609641 = 347431^2 + 27379^2 .

It is not an unprimeable number, because it can be changed into a prime (121457909401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6086099 + ... + 6106022.

Almost surely, 2^121457909402 is an apocalyptic number.

121457909402 is a deficient number, since it is larger than the sum of its proper divisors (72104219470).

121457909402 is a wasteful number, since it uses less digits than its factorization.

121457909402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12192433.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 121457909402 in words is "one hundred twenty-one billion, four hundred fifty-seven million, nine hundred nine thousand, four hundred two".