21112377642 has 48 divisors (see below), whose sum is σ = 46620648360. Its totient is φ = 6903792000.

The previous prime is 21112377623. The next prime is 21112377653. The reversal of 21112377642 is 24677321112.

21112377642 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 2 + 3 + 7 + 7 + 642 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19446023601 + 1666354041 = 139449^2 + 40821^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112377597 and 21112377606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144892 + ... + 251432.

Almost surely, 2^21112377642 is an apocalyptic number.

21112377642 is an abundant number, since it is smaller than the sum of its proper divisors (25508270718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112377642 is a wasteful number, since it uses less digits than its factorization.

21112377642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106759 (or 106756 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

Adding to 21112377642 its reverse (24677321112), we get a palindrome (45789698754).

The spelling of 21112377642 in words is "twenty-one billion, one hundred twelve million, three hundred seventy-seven thousand, six hundred forty-two".