22021011988 has 6 divisors (see below), whose sum is σ = 38536770986. Its totient is φ = 11010505992.

The previous prime is 22021011983. The next prime is 22021012049. The reversal of 22021011988 is 88911012022.

It can be written as a sum of positive squares in only one way, i.e., 20661762564 + 1359249424 = 143742^2 + 36868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021011983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2752626495 + ... + 2752626502.

Almost surely, 2^22021011988 is an apocalyptic number.

It is an amenable number.

22021011988 is a deficient number, since it is larger than the sum of its proper divisors (16515758998).

22021011988 is a wasteful number, since it uses less digits than its factorization.

22021011988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505253001 (or 5505252999 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

Adding to 22021011988 its sum of digits (34), we get a palindrome (22021012022).

The spelling of 22021011988 in words is "twenty-two billion, twenty-one million, eleven thousand, nine hundred eighty-eight".