21431430220 has 48 divisors (see below), whose sum is σ = 45849595680. Its totient is φ = 8412401664.

The previous prime is 21431430211. The next prime is 21431430253. The reversal of 21431430220 is 2203413412.

It is a junction number, because it is equal to n+sod(n) for n = 21431430191 and 21431430200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665122 + ... + 696598.

It is an arithmetic number, because the mean of its divisors is an integer number (955199910).

Almost surely, 2^21431430220 is an apocalyptic number.

21431430220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431430220 is an abundant number, since it is smaller than the sum of its proper divisors (24418165460).

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

21431430220 is a wasteful number, since it uses less digits than its factorization.

21431430220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32122 (or 32120 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21431430220 its reverse (2203413412), we get a palindrome (23634843632).

The spelling of 21431430220 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, two hundred twenty".