121661870937 has 8 divisors (see below), whose sum is σ = 162219083136. Its totient is φ = 81106286352.

The previous prime is 121661870933. The next prime is 121661870951. The reversal of 121661870937 is 739078166121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121661870937 - 2² = 121661870933 is a prime.

It is a super-2 number, since 2×121661870937² (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 121661870937.

It is not an unprimeable number, because it can be changed into a prime (121661870933) 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, 220258 + ... + 540219.

It is an arithmetic number, because the mean of its divisors is an integer number (20277385392).

Almost surely, 2^121661870937 is an apocalyptic number.

It is an amenable number.

121661870937 is a deficient number, since it is larger than the sum of its proper divisors (40557212199).

121661870937 is an equidigital number, since it uses as much as digits as its factorization.

121661870937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813807.

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 121661870937 in words is "one hundred twenty-one billion, six hundred sixty-one million, eight hundred seventy thousand, nine hundred thirty-seven".