21298058 has 4 divisors (see below), whose sum is σ = 31947090. Its totient is φ = 10649028.

The previous prime is 21298033. The next prime is 21298073. The reversal of 21298058 is 85089212.

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

It can be written as a sum of positive squares in only one way, i.e., 21132409 + 165649 = 4597^2 + 407^2 .

It is a super-3 number, since 3×21298058³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5324513 + ... + 5324516.

Almost surely, 2^21298058 is an apocalyptic number.

21298058 is a deficient number, since it is larger than the sum of its proper divisors (10649032).

21298058 is a wasteful number, since it uses less digits than its factorization.

21298058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649031.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21298058 is about 4614.9819067901. The cubic root of 21298058 is about 277.1915594686.

The spelling of 21298058 in words is "twenty-one million, two hundred ninety-eight thousand, fifty-eight".