21885538355 has 8 divisors (see below), whose sum is σ = 26579063952. Its totient is φ = 17297485408.

The previous prime is 21885538351. The next prime is 21885538397. The reversal of 21885538355 is 55383558812.

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

It is a cyclic number.

It is not a de Polignac number, because 21885538355 - 2² = 21885538351 is a prime.

It is a super-2 number, since 2×21885538355² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21885538297 and 21885538306.

It is not an unprimeable number, because it can be changed into a prime (21885538351) 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, 26367704 + ... + 26368533.

It is an arithmetic number, because the mean of its divisors is an integer number (3322382994).

Almost surely, 2^21885538355 is an apocalyptic number.

21885538355 is a deficient number, since it is larger than the sum of its proper divisors (4693525597).

21885538355 is an equidigital number, since it uses as much as digits as its factorization.

21885538355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52736325.

The product of its digits is 5760000, while the sum is 53.

The spelling of 21885538355 in words is "twenty-one billion, eight hundred eighty-five million, five hundred thirty-eight thousand, three hundred fifty-five".