22747521 has 8 divisors (see below), whose sum is σ = 31308544. Its totient is φ = 14675760.

The previous prime is 22747511. The next prime is 22747531. The reversal of 22747521 is 12574722.

It is an interprime number because it is at equal distance from previous prime (22747511) and next prime (22747531).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22747521 - 2¹⁰ = 22746497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22747511) 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, 122206 + ... + 122391.

It is an arithmetic number, because the mean of its divisors is an integer number (3913568).

Almost surely, 2^22747521 is an apocalyptic number.

It is an amenable number.

22747521 is a deficient number, since it is larger than the sum of its proper divisors (8561023).

22747521 is a wasteful number, since it uses less digits than its factorization.

22747521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244631.

The product of its digits is 7840, while the sum is 30.

The square root of 22747521 is about 4769.4361301940. The cubic root of 22747521 is about 283.3422630019.

The spelling of 22747521 in words is "twenty-two million, seven hundred forty-seven thousand, five hundred twenty-one".