21134442220 has 24 divisors (see below), whose sum is σ = 44721130608. Its totient is φ = 8389243200.

The previous prime is 21134442191. The next prime is 21134442223. The reversal of 21134442220 is 2224443112.

It is not an unprimeable number, because it can be changed into a prime (21134442223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4030671 + ... + 4035910.

It is an arithmetic number, because the mean of its divisors is an integer number (1863380442).

Almost surely, 2^21134442220 is an apocalyptic number.

21134442220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134442220 is an abundant number, since it is smaller than the sum of its proper divisors (23586688388).

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

21134442220 is a wasteful number, since it uses less digits than its factorization.

21134442220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8066721 (or 8066719 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21134442220 its reverse (2224443112), we get a palindrome (23358885332).

The spelling of 21134442220 in words is "twenty-one billion, one hundred thirty-four million, four hundred forty-two thousand, two hundred twenty".