21015112190 has 48 divisors (see below), whose sum is σ = 41869629648. Its totient is φ = 7567557888.

The previous prime is 21015112163. The next prime is 21015112219. The reversal of 21015112190 is 9121151012.

It is a super-2 number, since 2×21015112190² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26912 + ... + 206771.

It is an arithmetic number, because the mean of its divisors is an integer number (872283951).

Almost surely, 2^21015112190 is an apocalyptic number.

21015112190 is a deficient number, since it is larger than the sum of its proper divisors (20854517458).

21015112190 is a wasteful number, since it uses less digits than its factorization.

21015112190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233753 (or 233730 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 23.

The spelling of 21015112190 in words is "twenty-one billion, fifteen million, one hundred twelve thousand, one hundred ninety".