2221129764 has 72 divisors (see below), whose sum is σ = 6794057088. Its totient is φ = 597277440.

The previous prime is 2221129751. The next prime is 2221129817. The reversal of 2221129764 is 4679211222.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254952 + ... + 263519.

It is an arithmetic number, because the mean of its divisors is an integer number (94361904).

Almost surely, 2^2221129764 is an apocalyptic number.

It is an amenable number.

2221129764 is an abundant number, since it is smaller than the sum of its proper divisors (4572927324).

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

2221129764 is a wasteful number, since it uses less digits than its factorization.

2221129764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518505 (or 518500 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 2221129764 is about 47128.8633854032. The cubic root of 2221129764 is about 1304.7420038709.

The spelling of 2221129764 in words is "two billion, two hundred twenty-one million, one hundred twenty-nine thousand, seven hundred sixty-four".