21122174 has 8 divisors (see below), whose sum is σ = 31718208. Its totient is φ = 10549440.

The previous prime is 21122161. The next prime is 21122183. The reversal of 21122174 is 47122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21122174² = 892292468972552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3347 + ... + 7310.

It is an arithmetic number, because the mean of its divisors is an integer number (3964776).

Almost surely, 2^21122174 is an apocalyptic number.

21122174 is a deficient number, since it is larger than the sum of its proper divisors (10596034).

21122174 is a wasteful number, since it uses less digits than its factorization.

21122174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11650.

The product of its digits is 224, while the sum is 20.

The square root of 21122174 is about 4595.8866391590. The cubic root of 21122174 is about 276.4264132564.

Adding to 21122174 its reverse (47122112), we get a palindrome (68244286).

The spelling of 21122174 in words is "twenty-one million, one hundred twenty-two thousand, one hundred seventy-four".