21988891162 has 16 divisors (see below), whose sum is σ = 39912609600. Its totient is φ = 8869468608.

The previous prime is 21988891129. The next prime is 21988891163. The reversal of 21988891162 is 26119888912.

It is a super-2 number, since 2×21988891162² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21988891163) 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, 46194912 + ... + 46195387.

It is an arithmetic number, because the mean of its divisors is an integer number (2494538100).

Almost surely, 2^21988891162 is an apocalyptic number.

21988891162 is a deficient number, since it is larger than the sum of its proper divisors (17923718438).

21988891162 is a wasteful number, since it uses less digits than its factorization.

21988891162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92390325.

The product of its digits is 995328, while the sum is 55.

The spelling of 21988891162 in words is "twenty-one billion, nine hundred eighty-eight million, eight hundred ninety-one thousand, one hundred sixty-two".