21154372112 has 20 divisors (see below), whose sum is σ = 41238052560. Its totient is φ = 10512294048.

The previous prime is 21154372111. The next prime is 21154372157. The reversal of 21154372112 is 21127345112.

It is not an unprimeable number, because it can be changed into a prime (21154372111) 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, 4053062 + ... + 4058277.

It is an arithmetic number, because the mean of its divisors is an integer number (2061902628).

Almost surely, 2^21154372112 is an apocalyptic number.

It is an amenable number.

21154372112 is a deficient number, since it is larger than the sum of its proper divisors (20083680448).

21154372112 is a wasteful number, since it uses less digits than its factorization.

21154372112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111510 (or 8111504 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The spelling of 21154372112 in words is "twenty-one billion, one hundred fifty-four million, three hundred seventy-two thousand, one hundred twelve".