21245022112 has 12 divisors (see below), whose sum is σ = 41826137346. Its totient is φ = 10622511040.

The previous prime is 21245022107. The next prime is 21245022143. The reversal of 21245022112 is 21122054212.

It can be written as a sum of positive squares in only one way, i.e., 19333233936 + 1911788176 = 139044^2 + 43724^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331953439 + ... + 331953502.

Almost surely, 2^21245022112 is an apocalyptic number.

It is an amenable number.

21245022112 is a deficient number, since it is larger than the sum of its proper divisors (20581115234).

21245022112 is an equidigital number, since it uses as much as digits as its factorization.

21245022112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663906951 (or 663906943 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21245022112 its reverse (21122054212), we get a palindrome (42367076324).

The spelling of 21245022112 in words is "twenty-one billion, two hundred forty-five million, twenty-two thousand, one hundred twelve".