21273059 has 4 divisors (see below), whose sum is σ = 21293616. Its totient is φ = 21252504.

The previous prime is 21273023. The next prime is 21273061. The reversal of 21273059 is 95037212.

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

It is a cyclic number.

It is not a de Polignac number, because 21273059 - 2⁸ = 21272803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21273019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8639 + ... + 10824.

It is an arithmetic number, because the mean of its divisors is an integer number (5323404).

Almost surely, 2^21273059 is an apocalyptic number.

21273059 is a deficient number, since it is larger than the sum of its proper divisors (20557).

21273059 is a wasteful number, since it uses less digits than its factorization.

21273059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20556.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21273059 is about 4612.2726502235. The cubic root of 21273059 is about 277.0830640559.

The spelling of 21273059 in words is "twenty-one million, two hundred seventy-three thousand, fifty-nine".