22151721233823 has 16 divisors (see below), whose sum is σ = 31274163160416. Its totient is φ = 13898610339840.

The previous prime is 22151721233819. The next prime is 22151721233893. The reversal of 22151721233823 is 32833212715122.

It is a happy number.

It is not a de Polignac number, because 22151721233823 - 2² = 22151721233819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22151721233813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6541936 + ... + 9332757.

It is an arithmetic number, because the mean of its divisors is an integer number (1954635197526).

Almost surely, 2^{22151721233823} is an apocalyptic number.

22151721233823 is a deficient number, since it is larger than the sum of its proper divisors (9122441926593).

22151721233823 is a wasteful number, since it uses less digits than its factorization.

22151721233823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15902074.

The product of its digits is 241920, while the sum is 42.

Adding to 22151721233823 its reverse (32833212715122), we get a palindrome (54984933948945).

The spelling of 22151721233823 in words is "twenty-two trillion, one hundred fifty-one billion, seven hundred twenty-one million, two hundred thirty-three thousand, eight hundred twenty-three".