22068521 has 4 divisors (see below), whose sum is σ = 22538112. Its totient is φ = 21598932.

The previous prime is 22068509. The next prime is 22068547. The reversal of 22068521 is 12586022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12586022 = 2 ⋅6293011.

It is a cyclic number.

It is not a de Polignac number, because 22068521 - 2⁶ = 22068457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22068551) 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, 234725 + ... + 234818.

It is an arithmetic number, because the mean of its divisors is an integer number (5634528).

Almost surely, 2^22068521 is an apocalyptic number.

It is an amenable number.

22068521 is a deficient number, since it is larger than the sum of its proper divisors (469591).

22068521 is an equidigital number, since it uses as much as digits as its factorization.

22068521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469590.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 22068521 is about 4697.7144442803. The cubic root of 22068521 is about 280.4945384426.

The spelling of 22068521 in words is "twenty-two million, sixty-eight thousand, five hundred twenty-one".