21113130444 has 48 divisors (see below), whose sum is σ = 58117871616. Its totient is φ = 5837731200.

The previous prime is 21113130431. The next prime is 21113130469. The reversal of 21113130444 is 44403131112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4051377 + ... + 4056584.

It is an arithmetic number, because the mean of its divisors is an integer number (1210788992).

Almost surely, 2^21113130444 is an apocalyptic number.

It is an amenable number.

21113130444 is an abundant number, since it is smaller than the sum of its proper divisors (37004741172).

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

21113130444 is a wasteful number, since it uses less digits than its factorization.

21113130444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8108006 (or 8108004 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21113130444 its reverse (44403131112), we get a palindrome (65516261556).

The spelling of 21113130444 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty thousand, four hundred forty-four".