21058051 has 16 divisors (see below), whose sum is σ = 24837120. Its totient is φ = 17478720.

The previous prime is 21058049. The next prime is 21058057. The reversal of 21058051 is 15085012.

It is not a de Polignac number, because 21058051 - 2¹ = 21058049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21058057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68440 + ... + 68746.

It is an arithmetic number, because the mean of its divisors is an integer number (1552320).

Almost surely, 2^21058051 is an apocalyptic number.

21058051 is a deficient number, since it is larger than the sum of its proper divisors (3779069).

21058051 is a wasteful number, since it uses less digits than its factorization.

21058051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 21058051 is about 4588.9052071273. The cubic root of 21058051 is about 276.1464032835.

The spelling of 21058051 in words is "twenty-one million, fifty-eight thousand, fifty-one".