12021915890 has 16 divisors (see below), whose sum is σ = 21849542208. Its totient is φ = 4762078896.

The previous prime is 12021915883. The next prime is 12021915943. The reversal of 12021915890 is 9851912021.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5834852 + ... + 5836911.

It is an arithmetic number, because the mean of its divisors is an integer number (1365596388).

Almost surely, 2^12021915890 is an apocalyptic number.

12021915890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021915890 is a deficient number, since it is larger than the sum of its proper divisors (9827626318).

12021915890 is a wasteful number, since it uses less digits than its factorization.

12021915890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671873.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 12021915890 in words is "twelve billion, twenty-one million, nine hundred fifteen thousand, eight hundred ninety".