2221921637 has 8 divisors (see below), whose sum is σ = 2393212920. Its totient is φ = 2050683840.

The previous prime is 2221921633. The next prime is 2221921649. The reversal of 2221921637 is 7361291222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6713281 + 2215208356 = 2591^2 + 47066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221921637 - 2² = 2221921633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221921597 and 2221921606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221921633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129587 + ... + 145727.

It is an arithmetic number, because the mean of its divisors is an integer number (299151615).

Almost surely, 2^2221921637 is an apocalyptic number.

It is an amenable number.

2221921637 is a deficient number, since it is larger than the sum of its proper divisors (171291283).

2221921637 is a wasteful number, since it uses less digits than its factorization.

2221921637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26743.

The product of its digits is 18144, while the sum is 35.

The square root of 2221921637 is about 47137.2637835503. The cubic root of 2221921637 is about 1304.8970401686.

The spelling of 2221921637 in words is "two billion, two hundred twenty-one million, nine hundred twenty-one thousand, six hundred thirty-seven".