21074051 has 2 divisors, whose sum is σ = 21074052. Its totient is φ = 21074050.

The previous prime is 21074023. The next prime is 21074057. The reversal of 21074051 is 15047012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21074051 - 2¹⁰ = 21073027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21074057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10537025 + 10537026.

It is an arithmetic number, because the mean of its divisors is an integer number (10537026).

Almost surely, 2^21074051 is an apocalyptic number.

21074051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21074051 is an equidigital number, since it uses as much as digits as its factorization.

21074051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21074051 is about 4590.6482113096. The cubic root of 21074051 is about 276.2163246626.

The spelling of 21074051 in words is "twenty-one million, seventy-four thousand, fifty-one".