21901174 has 4 divisors (see below), whose sum is σ = 32851764. Its totient is φ = 10950586.

The previous prime is 21901171. The next prime is 21901183. The reversal of 21901174 is 47110912.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21901174² = 959322845156552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5475292 + ... + 5475295.

It is an arithmetic number, because the mean of its divisors is an integer number (8212941).

Almost surely, 2^21901174 is an apocalyptic number.

21901174 is a deficient number, since it is larger than the sum of its proper divisors (10950590).

21901174 is a wasteful number, since it uses less digits than its factorization.

21901174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950589.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21901174 is about 4679.8690152610. The cubic root of 21901174 is about 279.7837360682.

It can be divided in two parts, 2190 and 1174, that added together give a square (3364 = 58²).

The spelling of 21901174 in words is "twenty-one million, nine hundred one thousand, one hundred seventy-four".