21140403220 has 24 divisors (see below), whose sum is σ = 44413576704. Its totient is φ = 8452593696.

The previous prime is 21140403217. The next prime is 21140403233. The reversal of 21140403220 is 2230404112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174124 + ... + 269443.

It is an arithmetic number, because the mean of its divisors is an integer number (1850565696).

Almost surely, 2^21140403220 is an apocalyptic number.

21140403220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140403220 is an abundant number, since it is smaller than the sum of its proper divisors (23273173484).

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

21140403220 is a wasteful number, since it uses less digits than its factorization.

21140403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445959 (or 445957 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21140403220 its reverse (2230404112), we get a palindrome (23370807332).

The spelling of 21140403220 in words is "twenty-one billion, one hundred forty million, four hundred three thousand, two hundred twenty".