21242127136 has 24 divisors (see below), whose sum is σ = 41832927360. Its totient is φ = 10617891648.

The previous prime is 21242127131. The next prime is 21242127149. The reversal of 21242127136 is 63172124212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21242127098 and 21242127107.

It is not an unprimeable number, because it can be changed into a prime (21242127131) 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, 11605 + ... + 206443.

It is an arithmetic number, because the mean of its divisors is an integer number (1743038640).

Almost surely, 2^21242127136 is an apocalyptic number.

It is an amenable number.

21242127136 is a deficient number, since it is larger than the sum of its proper divisors (20590800224).

21242127136 is a wasteful number, since it uses less digits than its factorization.

21242127136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198256 (or 198248 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The spelling of 21242127136 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty-seven thousand, one hundred thirty-six".