2221564620 has 48 divisors (see below), whose sum is σ = 6785872128. Its totient is φ = 538560960.

The previous prime is 2221564613. The next prime is 2221564649. The reversal of 2221564620 is 264651222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1682344 + ... + 1683663.

It is an arithmetic number, because the mean of its divisors is an integer number (141372336).

Almost surely, 2^2221564620 is an apocalyptic number.

2221564620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221564620 is an abundant number, since it is smaller than the sum of its proper divisors (4564307508).

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

2221564620 is a wasteful number, since it uses less digits than its factorization.

2221564620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3366030 (or 3366028 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2221564620 is about 47133.4766381603. The cubic root of 2221564620 is about 1304.8271464074.

The spelling of 2221564620 in words is "two billion, two hundred twenty-one million, five hundred sixty-four thousand, six hundred twenty".