22553533721 has 8 divisors (see below), whose sum is σ = 22927770624. Its totient is φ = 22179442320.

The previous prime is 22553533687. The next prime is 22553533733. The reversal of 22553533721 is 12733535522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22553533721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22553533781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302090 + ... + 369276.

It is an arithmetic number, because the mean of its divisors is an integer number (2865971328).

Almost surely, 2^22553533721 is an apocalyptic number.

It is an amenable number.

22553533721 is a deficient number, since it is larger than the sum of its proper divisors (374236903).

22553533721 is an equidigital number, since it uses as much as digits as its factorization.

22553533721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72751.

The product of its digits is 189000, while the sum is 38.

The spelling of 22553533721 in words is "twenty-two billion, five hundred fifty-three million, five hundred thirty-three thousand, seven hundred twenty-one".