22037521 has 4 divisors (see below), whose sum is σ = 24040944. Its totient is φ = 20034100.

The previous prime is 22037447. The next prime is 22037537. The reversal of 22037521 is 12573022.

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 22037521 - 2⁹ = 22037009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22037492 and 22037501.

It is not an unprimeable number, because it can be changed into a prime (22037581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001695 + ... + 1001716.

It is an arithmetic number, because the mean of its divisors is an integer number (6010236).

Almost surely, 2^22037521 is an apocalyptic number.

It is an amenable number.

22037521 is a deficient number, since it is larger than the sum of its proper divisors (2003423).

22037521 is a wasteful number, since it uses less digits than its factorization.

22037521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003422.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 22037521 is about 4694.4138079211. The cubic root of 22037521 is about 280.3631385275.

The spelling of 22037521 in words is "twenty-two million, thirty-seven thousand, five hundred twenty-one".