21166423190 has 32 divisors (see below), whose sum is σ = 41620019616. Its totient is φ = 7686351360.

The previous prime is 21166423177. The next prime is 21166423217. The reversal of 21166423190 is 9132466112.

It is a super-2 number, since 2×21166423190² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21166423190.

It is a congruent number.

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, 50627 + ... + 211886.

It is an arithmetic number, because the mean of its divisors is an integer number (1300625613).

Almost surely, 2^21166423190 is an apocalyptic number.

21166423190 is a deficient number, since it is larger than the sum of its proper divisors (20453596426).

21166423190 is a wasteful number, since it uses less digits than its factorization.

21166423190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263264.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21166423190 in words is "twenty-one billion, one hundred sixty-six million, four hundred twenty-three thousand, one hundred ninety".