21942174 has 8 divisors (see below), whose sum is σ = 43884360. Its totient is φ = 7314056.

The previous prime is 21942143. The next prime is 21942191. The reversal of 21942174 is 47124912.

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

21942174 is an admirable number.

It is a Curzon number.

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, 1828509 + ... + 1828520.

It is an arithmetic number, because the mean of its divisors is an integer number (5485545).

Almost surely, 2^21942174 is an apocalyptic number.

21942174 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21942174 is a wasteful number, since it uses less digits than its factorization.

21942174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657034.

The product of its digits is 4032, while the sum is 30.

The square root of 21942174 is about 4684.2474315518. The cubic root of 21942174 is about 279.9582165542.

The spelling of 21942174 in words is "twenty-one million, nine hundred forty-two thousand, one hundred seventy-four".