21974126 has 4 divisors (see below), whose sum is σ = 32961192. Its totient is φ = 10987062.

The previous prime is 21974119. The next prime is 21974179. The reversal of 21974126 is 62147912.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21974092 and 21974101.

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, 5493530 + ... + 5493533.

It is an arithmetic number, because the mean of its divisors is an integer number (8240298).

Almost surely, 2^21974126 is an apocalyptic number.

21974126 is a deficient number, since it is larger than the sum of its proper divisors (10987066).

21974126 is a wasteful number, since it uses less digits than its factorization.

21974126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10987065.

The product of its digits is 6048, while the sum is 32.

The square root of 21974126 is about 4687.6567707118. The cubic root of 21974126 is about 280.0940415407.

The spelling of 21974126 in words is "twenty-one million, nine hundred seventy-four thousand, one hundred twenty-six".