21476051 has 2 divisors, whose sum is σ = 21476052. Its totient is φ = 21476050.

The previous prime is 21476027. The next prime is 21476053. The reversal of 21476051 is 15067412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21476051 is a prime.

It is a super-2 number, since 2×21476051² = 922441533109202, which contains 22 as substring.

Together with 21476053, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21476051.

It is not a weakly prime, because it can be changed into another prime (21476053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738025 + 10738026.

It is an arithmetic number, because the mean of its divisors is an integer number (10738026).

Almost surely, 2^21476051 is an apocalyptic number.

21476051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476051 is an equidigital number, since it uses as much as digits as its factorization.

21476051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21476051 is about 4634.2260410990. The cubic root of 21476051 is about 277.9616038271.

The spelling of 21476051 in words is "twenty-one million, four hundred seventy-six thousand, fifty-one".