22721090 has 16 divisors (see below), whose sum is σ = 46740672. Its totient is φ = 7790064.

The previous prime is 22721081. The next prime is 22721099. The reversal of 22721090 is 9012722.

It is an interprime number because it is at equal distance from previous prime (22721081) and next prime (22721099).

It is not an unprimeable number, because it can be changed into a prime (22721099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162224 + ... + 162363.

It is an arithmetic number, because the mean of its divisors is an integer number (2921292).

Almost surely, 2^22721090 is an apocalyptic number.

22721090 is an abundant number, since it is smaller than the sum of its proper divisors (24019582).

22721090 is a wasteful number, since it uses less digits than its factorization.

22721090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324601.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22721090 is about 4766.6644522139. The cubic root of 22721090 is about 283.2324792912.

The spelling of 22721090 in words is "twenty-two million, seven hundred twenty-one thousand, ninety".