2150921721 has 8 divisors (see below), whose sum is σ = 3088503040. Its totient is φ = 1323644112.

The previous prime is 2150921711. The next prime is 2150921761. The reversal of 2150921721 is 1271290512.

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

It is not a de Polignac number, because 2150921721 - 2¹⁹ = 2150397433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2150921711) 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, 27575881 + ... + 27575958.

It is an arithmetic number, because the mean of its divisors is an integer number (386062880).

Almost surely, 2^2150921721 is an apocalyptic number.

It is an amenable number.

2150921721 is a deficient number, since it is larger than the sum of its proper divisors (937581319).

2150921721 is a wasteful number, since it uses less digits than its factorization.

2150921721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55151855.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 2150921721 is about 46378.0305856124. The cubic root of 2150921721 is about 1290.8472932508.

The spelling of 2150921721 in words is "two billion, one hundred fifty million, nine hundred twenty-one thousand, seven hundred twenty-one".