21526093 has 4 divisors (see below), whose sum is σ = 21581820. Its totient is φ = 21470368.

The previous prime is 21526067. The next prime is 21526103. The reversal of 21526093 is 39062512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6487209 + 15038884 = 2547^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 21526093 - 2⁵ = 21526061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21526693) 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, 27280 + ... + 28057.

It is an arithmetic number, because the mean of its divisors is an integer number (5395455).

Almost surely, 2^21526093 is an apocalyptic number.

It is an amenable number.

21526093 is a deficient number, since it is larger than the sum of its proper divisors (55727).

21526093 is an equidigital number, since it uses as much as digits as its factorization.

21526093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55726.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21526093 is about 4639.6220751264. The cubic root of 21526093 is about 278.1773319529.

The spelling of 21526093 in words is "twenty-one million, five hundred twenty-six thousand, ninety-three".