21032201220 has 24 divisors (see below), whose sum is σ = 58890163584. Its totient is φ = 5608586976.

The previous prime is 21032201209. The next prime is 21032201291. The reversal of 21032201220 is 2210223012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21032201220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175268284 + ... + 175268403.

It is an arithmetic number, because the mean of its divisors is an integer number (2453756816).

Almost surely, 2^21032201220 is an apocalyptic number.

21032201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032201220 is an abundant number, since it is smaller than the sum of its proper divisors (37857962364).

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

21032201220 is a wasteful number, since it uses less digits than its factorization.

21032201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350536699 (or 350536697 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21032201220 its reverse (2210223012), we get a palindrome (23242424232).

The spelling of 21032201220 in words is "twenty-one billion, thirty-two million, two hundred one thousand, two hundred twenty".