21173022 has 32 divisors (see below), whose sum is σ = 50672160. Its totient is φ = 6514560.

The previous prime is 21173021. The next prime is 21173029. The reversal of 21173022 is 22037112.

It is a super-2 number, since 2×21173022² = 896593721224968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21172986 and 21173004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21173021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14379 + ... + 15782.

It is an arithmetic number, because the mean of its divisors is an integer number (1583505).

Almost surely, 2^21173022 is an apocalyptic number.

21173022 is an abundant number, since it is smaller than the sum of its proper divisors (29499138).

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

21173022 is a wasteful number, since it uses less digits than its factorization.

21173022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30185 (or 30179 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21173022 is about 4601.4152170827. The cubic root of 21173022 is about 276.6480518435.

The spelling of 21173022 in words is "twenty-one million, one hundred seventy-three thousand, twenty-two".