22120187861 has 8 divisors (see below), whose sum is σ = 22354434648. Its totient is φ = 21886240000.

The previous prime is 22120187849. The next prime is 22120187863. The reversal of 22120187861 is 16878102122.

It can be written as a sum of positive squares in 4 ways, for example, as 13320622225 + 8799565636 = 115415^2 + 93806^2 .

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 22120187861 - 2⁶ = 22120187797 is a prime.

It is a super-2 number, since 2×22120187861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120187863) 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, 75641 + ... + 223521.

It is an arithmetic number, because the mean of its divisors is an integer number (2794304331).

Almost surely, 2^22120187861 is an apocalyptic number.

It is an amenable number.

22120187861 is a deficient number, since it is larger than the sum of its proper divisors (234246787).

22120187861 is a wasteful number, since it uses less digits than its factorization.

22120187861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149463.

The product of its (nonzero) digits is 21504, while the sum is 38.

Adding to 22120187861 its reverse (16878102122), we get a palindrome (38998289983).

The spelling of 22120187861 in words is "twenty-two billion, one hundred twenty million, one hundred eighty-seven thousand, eight hundred sixty-one".