22219751681 has 4 divisors (see below), whose sum is σ = 22220713812. Its totient is φ = 22218789552.

The previous prime is 22219751677. The next prime is 22219751693. The reversal of 22219751681 is 18615791222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17052442225 + 5167309456 = 130585^2 + 71884^2 .

It is a cyclic number.

It is not a de Polignac number, because 22219751681 - 2² = 22219751677 is a prime.

It is a super-2 number, since 2×22219751681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22219756681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445550 + ... + 492903.

It is an arithmetic number, because the mean of its divisors is an integer number (5555178453).

Almost surely, 2^22219751681 is an apocalyptic number.

It is an amenable number.

22219751681 is a deficient number, since it is larger than the sum of its proper divisors (962131).

22219751681 is an equidigital number, since it uses as much as digits as its factorization.

22219751681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962130.

The product of its digits is 120960, while the sum is 44.

The spelling of 22219751681 in words is "twenty-two billion, two hundred nineteen million, seven hundred fifty-one thousand, six hundred eighty-one".