12121897636 has 24 divisors (see below), whose sum is σ = 21906097920. Its totient is φ = 5863164000.

The previous prime is 12121897631. The next prime is 12121897637. The reversal of 12121897636 is 63679812121.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12121897631) 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, 328311 + ... + 363361.

It is an arithmetic number, because the mean of its divisors is an integer number (912754080).

Almost surely, 2^12121897636 is an apocalyptic number.

It is an amenable number.

12121897636 is a deficient number, since it is larger than the sum of its proper divisors (9784200284).

12121897636 is a wasteful number, since it uses less digits than its factorization.

12121897636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37875 (or 37873 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The spelling of 12121897636 in words is "twelve billion, one hundred twenty-one million, eight hundred ninety-seven thousand, six hundred thirty-six".