21974555116 has 6 divisors (see below), whose sum is σ = 38455471460. Its totient is φ = 10987277556.

The previous prime is 21974555063. The next prime is 21974555117. The reversal of 21974555116 is 61155547912.

It is a super-2 number, since 2×21974555116² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21974555117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2746819386 + ... + 2746819393.

Almost surely, 2^21974555116 is an apocalyptic number.

It is an amenable number.

21974555116 is a deficient number, since it is larger than the sum of its proper divisors (16480916344).

21974555116 is a wasteful number, since it uses less digits than its factorization.

21974555116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493638783 (or 5493638781 counting only the distinct ones).

The product of its digits is 378000, while the sum is 46.

The spelling of 21974555116 in words is "twenty-one billion, nine hundred seventy-four million, five hundred fifty-five thousand, one hundred sixteen".