21674942 has 4 divisors (see below), whose sum is σ = 32512416. Its totient is φ = 10837470.

The previous prime is 21674929. The next prime is 21674957. The reversal of 21674942 is 24947612.

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

It is a super-2 number, since 2×21674942² = 939606221406728, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5418734 + ... + 5418737.

It is an arithmetic number, because the mean of its divisors is an integer number (8128104).

Almost surely, 2^21674942 is an apocalyptic number.

21674942 is a deficient number, since it is larger than the sum of its proper divisors (10837474).

21674942 is a wasteful number, since it uses less digits than its factorization.

21674942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10837473.

The product of its digits is 24192, while the sum is 35.

The square root of 21674942 is about 4655.6355097881. The cubic root of 21674942 is about 278.8170415272.

The spelling of 21674942 in words is "twenty-one million, six hundred seventy-four thousand, nine hundred forty-two".