21058402 has 8 divisors (see below), whose sum is σ = 32441436. Its totient is φ = 10244592.

The previous prime is 21058369. The next prime is 21058417. The reversal of 21058402 is 20485012.

It can be written as a sum of positive squares in 2 ways, for example, as 14753281 + 6305121 = 3841^2 + 2511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142213 + ... + 142360.

Almost surely, 2^21058402 is an apocalyptic number.

21058402 is a deficient number, since it is larger than the sum of its proper divisors (11383034).

21058402 is a wasteful number, since it uses less digits than its factorization.

21058402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284612.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21058402 is about 4588.9434513840. The cubic root of 21058402 is about 276.1479375637.

The spelling of 21058402 in words is "twenty-one million, fifty-eight thousand, four hundred two".