12021172890 has 32 divisors (see below), whose sum is σ = 30369280320. Its totient is φ = 3036927744.

The previous prime is 12021172859. The next prime is 12021172921. The reversal of 12021172890 is 9827112021.

It is an interprime number because it is at equal distance from previous prime (12021172859) and next prime (12021172921).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10544319 + ... + 10545458.

It is an arithmetic number, because the mean of its divisors is an integer number (949040010).

Almost surely, 2^12021172890 is an apocalyptic number.

12021172890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021172890 is an abundant number, since it is smaller than the sum of its proper divisors (18348107430).

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

12021172890 is a wasteful number, since it uses less digits than its factorization.

12021172890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21089806.

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 12021172890 in words is "twelve billion, twenty-one million, one hundred seventy-two thousand, eight hundred ninety".