21420230244 has 36 divisors (see below), whose sum is σ = 58140626544. Its totient is φ = 6120065616.

The previous prime is 21420230189. The next prime is 21420230263. The reversal of 21420230244 is 44203202412.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18213894 + ... + 18215069.

It is an arithmetic number, because the mean of its divisors is an integer number (1615017404).

Almost surely, 2^21420230244 is an apocalyptic number.

It is an amenable number.

21420230244 is an abundant number, since it is smaller than the sum of its proper divisors (36720396300).

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

21420230244 is a wasteful number, since it uses less digits than its factorization.

21420230244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36428984 (or 36428975 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21420230244 its reverse (44203202412), we get a palindrome (65623432656).

The spelling of 21420230244 in words is "twenty-one billion, four hundred twenty million, two hundred thirty thousand, two hundred forty-four".