22521091 has 2 divisors, whose sum is σ = 22521092. Its totient is φ = 22521090.

The previous prime is 22521089. The next prime is 22521101. The reversal of 22521091 is 19012522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22521091 - 2¹ = 22521089 is a prime.

Together with 22521089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22521041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260545 + 11260546.

It is an arithmetic number, because the mean of its divisors is an integer number (11260546).

Almost surely, 2^22521091 is an apocalyptic number.

22521091 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521091 is an equidigital number, since it uses as much as digits as its factorization.

22521091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 22521091 is about 4745.6391561095. The cubic root of 22521091 is about 282.3989917426.

It can be divided in two parts, 225 and 21091, that added together give a square (21316 = 146²).

The spelling of 22521091 in words is "twenty-two million, five hundred twenty-one thousand, ninety-one".