21420244232 has 16 divisors (see below), whose sum is σ = 40244763600. Its totient is φ = 10688307280.

The previous prime is 21420244201. The next prime is 21420244253. The reversal of 21420244232 is 23244202412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2722682 + ... + 2730537.

It is an arithmetic number, because the mean of its divisors is an integer number (2515297725).

Almost surely, 2^21420244232 is an apocalyptic number.

It is an amenable number.

21420244232 is a deficient number, since it is larger than the sum of its proper divisors (18824519368).

21420244232 is a wasteful number, since it uses less digits than its factorization.

21420244232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453716 (or 5453712 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21420244232 its reverse (23244202412), we get a palindrome (44664446644).

The spelling of 21420244232 in words is "twenty-one billion, four hundred twenty million, two hundred forty-four thousand, two hundred thirty-two".