22151721233819 has 2 divisors, whose sum is σ = 22151721233820. Its totient is φ = 22151721233818.

The previous prime is 22151721233813. The next prime is 22151721233893. The reversal of 22151721233819 is 91833212715122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22151721233819 - 2⁴⁴ = 4559535189403 is a prime.

It is a super-2 number, since 2×22151721233819² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (22151721233813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11075860616909 + 11075860616910.

It is an arithmetic number, because the mean of its divisors is an integer number (11075860616910).

Almost surely, 2^{22151721233819} is an apocalyptic number.

22151721233819 is a deficient number, since it is larger than the sum of its proper divisors (1).

22151721233819 is an equidigital number, since it uses as much as digits as its factorization.

22151721233819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The spelling of 22151721233819 in words is "twenty-two trillion, one hundred fifty-one billion, seven hundred twenty-one million, two hundred thirty-three thousand, eight hundred nineteen".