21601807451822 has 16 divisors (see below), whose sum is σ = 34905798668832. Its totient is φ = 9967044621600.

The previous prime is 21601807451713. The next prime is 21601807451827. The reversal of 21601807451822 is 22815470810612.

It is a super-2 number, since 2×21601807451822² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601807451827) 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, 125760698 + ... + 125932349.

It is an arithmetic number, because the mean of its divisors is an integer number (2181612416802).

Almost surely, 2^{21601807451822} is an apocalyptic number.

21601807451822 is a deficient number, since it is larger than the sum of its proper divisors (13303991217010).

21601807451822 is a wasteful number, since it uses less digits than its factorization.

21601807451822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251696363.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 21601807451822 in words is "twenty-one trillion, six hundred one billion, eight hundred seven million, four hundred fifty-one thousand, eight hundred twenty-two".