121557115606 has 16 divisors (see below), whose sum is σ = 182482501680. Its totient is φ = 60729639840.

The previous prime is 121557115573. The next prime is 121557115607. The reversal of 121557115606 is 606511755121.

It is a super-2 number, since 2×121557115606² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121557115607) 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, 21777736 + ... + 21783316.

It is an arithmetic number, because the mean of its divisors is an integer number (11405156355).

Almost surely, 2^121557115606 is an apocalyptic number.

121557115606 is a deficient number, since it is larger than the sum of its proper divisors (60925386074).

121557115606 is a wasteful number, since it uses less digits than its factorization.

121557115606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12399.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 121557115606 in words is "one hundred twenty-one billion, five hundred fifty-seven million, one hundred fifteen thousand, six hundred six".