21132042220 has 12 divisors (see below), whose sum is σ = 44377288704. Its totient is φ = 8452816880.

The previous prime is 21132042203. The next prime is 21132042221. The reversal of 21132042220 is 2224023112.

It is not an unprimeable number, because it can be changed into a prime (21132042221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528301036 + ... + 528301075.

It is an arithmetic number, because the mean of its divisors is an integer number (3698107392).

Almost surely, 2^21132042220 is an apocalyptic number.

21132042220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132042220 is an abundant number, since it is smaller than the sum of its proper divisors (23245246484).

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

21132042220 is a wasteful number, since it uses less digits than its factorization.

21132042220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056602120 (or 1056602118 counting only the distinct ones).

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

Adding to 21132042220 its reverse (2224023112), we get a palindrome (23356065332).

The spelling of 21132042220 in words is "twenty-one billion, one hundred thirty-two million, forty-two thousand, two hundred twenty".