21474051 has 4 divisors (see below), whose sum is σ = 28632072. Its totient is φ = 14316032.

The previous prime is 21474031. The next prime is 21474059. The reversal of 21474051 is 15047412.

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

It is a cyclic number.

It is not a de Polignac number, because 21474051 - 2⁶ = 21473987 is a prime.

It is a super-2 number, since 2×21474051² = 922269732701202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21474059) 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, 3579006 + ... + 3579011.

It is an arithmetic number, because the mean of its divisors is an integer number (7158018).

Almost surely, 2^21474051 is an apocalyptic number.

21474051 is a deficient number, since it is larger than the sum of its proper divisors (7158021).

21474051 is an equidigital number, since it uses as much as digits as its factorization.

21474051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158020.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 21474051 is about 4634.0102503124. The cubic root of 21474051 is about 277.9529749833.

The spelling of 21474051 in words is "twenty-one million, four hundred seventy-four thousand, fifty-one".