121715608690 has 16 divisors (see below), whose sum is σ = 235941026328. Its totient is φ = 44941147776.

The previous prime is 121715608669. The next prime is 121715608699. The reversal of 121715608690 is 96806517121.

It can be written as a sum of positive squares in 4 ways, for example, as 43593681681 + 78121927009 = 208791^2 + 279503^2 .

It is a super-2 number, since 2×121715608690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121715608690.

It is not an unprimeable number, because it can be changed into a prime (121715608699) 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, 468136827 + ... + 468137086.

Almost surely, 2^121715608690 is an apocalyptic number.

121715608690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121715608690 is a deficient number, since it is larger than the sum of its proper divisors (114225417638).

121715608690 is a wasteful number, since it uses less digits than its factorization.

121715608690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936273933.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 121715608690 in words is "one hundred twenty-one billion, seven hundred fifteen million, six hundred eight thousand, six hundred ninety".