21373071 has 4 divisors (see below), whose sum is σ = 28497432. Its totient is φ = 14248712.

The previous prime is 21373069. The next prime is 21373103. The reversal of 21373071 is 17037312.

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 21373071 - 2¹ = 21373069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373061) 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, 3562176 + ... + 3562181.

It is an arithmetic number, because the mean of its divisors is an integer number (7124358).

Almost surely, 2^21373071 is an apocalyptic number.

21373071 is a deficient number, since it is larger than the sum of its proper divisors (7124361).

21373071 is an equidigital number, since it uses as much as digits as its factorization.

21373071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124360.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21373071 is about 4623.1018807723. The cubic root of 21373071 is about 277.5166064244.

The spelling of 21373071 in words is "twenty-one million, three hundred seventy-three thousand, seventy-one".