22313521 has 4 divisors (see below), whose sum is σ = 23033344. Its totient is φ = 21593700.

The previous prime is 22313509. The next prime is 22313527. The reversal of 22313521 is 12531322.

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.

It is a cyclic number.

It is not a de Polignac number, because 22313521 - 2⁷ = 22313393 is a prime.

It is a super-3 number, since 3×22313521³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22313527) 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, 359865 + ... + 359926.

It is an arithmetic number, because the mean of its divisors is an integer number (5758336).

Almost surely, 2^22313521 is an apocalyptic number.

It is an amenable number.

22313521 is a deficient number, since it is larger than the sum of its proper divisors (719823).

22313521 is an equidigital number, since it uses as much as digits as its factorization.

22313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719822.

The product of its digits is 360, while the sum is 19.

The square root of 22313521 is about 4723.7189797870. The cubic root of 22313521 is about 281.5287175445.

Adding to 22313521 its reverse (12531322), we get a palindrome (34844843).

The spelling of 22313521 in words is "twenty-two million, three hundred thirteen thousand, five hundred twenty-one".