21213058 has 8 divisors (see below), whose sum is σ = 31839552. Its totient is φ = 10599876.

The previous prime is 21213047. The next prime is 21213089. The reversal of 21213058 is 85031212.

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

It is a super-3 number, since 3×21213058³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 3291 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (3979944).

Almost surely, 2^21213058 is an apocalyptic number.

21213058 is a deficient number, since it is larger than the sum of its proper divisors (10626494).

21213058 is a wasteful number, since it uses less digits than its factorization.

21213058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21213058 is about 4605.7635631891. The cubic root of 21213058 is about 276.8223130269.

The spelling of 21213058 in words is "twenty-one million, two hundred thirteen thousand, fifty-eight".