2221921646 has 16 divisors (see below), whose sum is σ = 3818962944. Its totient is φ = 949763544.

The previous prime is 2221921633. The next prime is 2221921649. The reversal of 2221921646 is 6461291222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221921649) 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, 201830 + ... + 212553.

It is an arithmetic number, because the mean of its divisors is an integer number (238685184).

Almost surely, 2^2221921646 is an apocalyptic number.

2221921646 is a deficient number, since it is larger than the sum of its proper divisors (1597041298).

2221921646 is a wasteful number, since it uses less digits than its factorization.

2221921646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414775.

The product of its digits is 20736, while the sum is 35.

The square root of 2221921646 is about 47137.2638790161. The cubic root of 2221921646 is about 1304.8970419304.

The spelling of 2221921646 in words is "two billion, two hundred twenty-one million, nine hundred twenty-one thousand, six hundred forty-six".