21112430660 has 24 divisors (see below), whose sum is σ = 44583799680. Its totient is φ = 8397792224.

The previous prime is 21112430657. The next prime is 21112430719. The reversal of 21112430660 is 6603421112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2945084 + ... + 2952243.

It is an arithmetic number, because the mean of its divisors is an integer number (1857658320).

Almost surely, 2^21112430660 is an apocalyptic number.

21112430660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112430660 is an abundant number, since it is smaller than the sum of its proper divisors (23471369020).

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

21112430660 is a wasteful number, since it uses less digits than its factorization.

21112430660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5897515 (or 5897513 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21112430660 its reverse (6603421112), we get a palindrome (27715851772).

The spelling of 21112430660 in words is "twenty-one billion, one hundred twelve million, four hundred thirty thousand, six hundred sixty".