21474937 has 4 divisors (see below), whose sum is σ = 23427216. Its totient is φ = 19522660.

The previous prime is 21474919. The next prime is 21474941. The reversal of 21474937 is 73947412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21474937 - 2¹⁹ = 20950649 is a prime.

It is a super-2 number, since 2×21474937² = 922345838307938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21474896 and 21474905.

It is not an unprimeable number, because it can be changed into a prime (21474977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976123 + ... + 976144.

It is an arithmetic number, because the mean of its divisors is an integer number (5856804).

Almost surely, 2^21474937 is an apocalyptic number.

It is an amenable number.

21474937 is a deficient number, since it is larger than the sum of its proper divisors (1952279).

21474937 is a wasteful number, since it uses less digits than its factorization.

21474937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952278.

The product of its digits is 42336, while the sum is 37.

The square root of 21474937 is about 4634.1058468706. The cubic root of 21474937 is about 277.9567976272.

The spelling of 21474937 in words is "twenty-one million, four hundred seventy-four thousand, nine hundred thirty-seven".