2221501788 has 120 divisors (see below), whose sum is σ = 6540086784. Its totient is φ = 651434400.

The previous prime is 2221501771. The next prime is 2221501813. The reversal of 2221501788 is 8871051222.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 100431 + ... + 120537.

Almost surely, 2^2221501788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221501788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3270043392).

2221501788 is an abundant number, since it is smaller than the sum of its proper divisors (4318584996).

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

2221501788 is a wasteful number, since it uses less digits than its factorization.

2221501788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20165 (or 20154 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 2221501788 is about 47132.8101008204. The cubic root of 2221501788 is about 1304.8148449163.

The spelling of 2221501788 in words is "two billion, two hundred twenty-one million, five hundred one thousand, seven hundred eighty-eight".