22148521 has 4 divisors (see below), whose sum is σ = 22460544. Its totient is φ = 21836500.

The previous prime is 22148479. The next prime is 22148543. The reversal of 22148521 is 12584122.

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 a de Polignac number, because none of the positive numbers 2^k-22148521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22148561) 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, 155905 + ... + 156046.

It is an arithmetic number, because the mean of its divisors is an integer number (5615136).

Almost surely, 2^22148521 is an apocalyptic number.

It is an amenable number.

22148521 is a deficient number, since it is larger than the sum of its proper divisors (312023).

22148521 is an equidigital number, since it uses as much as digits as its factorization.

22148521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312022.

The product of its digits is 1280, while the sum is 25.

The square root of 22148521 is about 4706.2215204982. The cubic root of 22148521 is about 280.8330674350.

The spelling of 22148521 in words is "twenty-two million, one hundred forty-eight thousand, five hundred twenty-one".