6621122220 has 48 divisors (see below), whose sum is σ = 18719151360. Its totient is φ = 1748488896.

The previous prime is 6621122191. The next prime is 6621122273. The reversal of 6621122220 is 222211266.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529510 + ... + 541869.

It is an arithmetic number, because the mean of its divisors is an integer number (389982320).

Almost surely, 2^6621122220 is an apocalyptic number.

6621122220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6621122220 is an abundant number, since it is smaller than the sum of its proper divisors (12098029140).

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

6621122220 is a wasteful number, since it uses less digits than its factorization.

6621122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071494 (or 1071492 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6621122220 is about 81370.2784805361. The cubic root of 6621122220 is about 1877.7763640878.

Adding to 6621122220 its reverse (222211266), we get a palindrome (6843333486).

The spelling of 6621122220 in words is "six billion, six hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".