21419974 has 4 divisors (see below), whose sum is σ = 32129964. Its totient is φ = 10709986.

The previous prime is 21419939. The next prime is 21420001. The reversal of 21419974 is 47991412.

21419974 is nontrivially palindromic in base 13.

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

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, 5354992 + ... + 5354995.

It is an arithmetic number, because the mean of its divisors is an integer number (8032491).

Almost surely, 2^21419974 is an apocalyptic number.

21419974 is a deficient number, since it is larger than the sum of its proper divisors (10709990).

21419974 is a wasteful number, since it uses less digits than its factorization.

21419974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709989.

The product of its digits is 18144, while the sum is 37.

The square root of 21419974 is about 4628.1717772788. The cubic root of 21419974 is about 277.7194606228.

The spelling of 21419974 in words is "twenty-one million, four hundred nineteen thousand, nine hundred seventy-four".