12021997974 has 32 divisors (see below), whose sum is σ = 27929331456. Its totient is φ = 3378546720.

The previous prime is 12021997973. The next prime is 12021997979. The reversal of 12021997974 is 47979912021.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021997973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2343652 + ... + 2348775.

It is an arithmetic number, because the mean of its divisors is an integer number (872791608).

Almost surely, 2^12021997974 is an apocalyptic number.

12021997974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12021997974 is an abundant number, since it is smaller than the sum of its proper divisors (15907333482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12021997974 is a wasteful number, since it uses less digits than its factorization.

12021997974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4692500.

The product of its (nonzero) digits is 571536, while the sum is 51.

The spelling of 12021997974 in words is "twelve billion, twenty-one million, nine hundred ninety-seven thousand, nine hundred seventy-four".