2205437721 has 8 divisors (see below), whose sum is σ = 2940813120. Its totient is φ = 1470177072.

The previous prime is 2205437719. The next prime is 2205437723. The reversal of 2205437721 is 1277345022.

It is an interprime number because it is at equal distance from previous prime (2205437719) and next prime (2205437723).

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

It is not a de Polignac number, because 2205437721 - 2¹ = 2205437719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2205437723) 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, 38931 + ... + 76983.

It is an arithmetic number, because the mean of its divisors is an integer number (367601640).

Almost surely, 2^2205437721 is an apocalyptic number.

It is an amenable number.

2205437721 is a deficient number, since it is larger than the sum of its proper divisors (735375399).

2205437721 is a wasteful number, since it uses less digits than its factorization.

2205437721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57375.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 2205437721 is about 46962.0881243584. The cubic root of 2205437721 is about 1301.6621187607.

The spelling of 2205437721 in words is "two billion, two hundred five million, four hundred thirty-seven thousand, seven hundred twenty-one".