45921721 has 8 divisors (see below), whose sum is σ = 47210240. Its totient is φ = 44643312.

The previous prime is 45921719. The next prime is 45921739. The reversal of 45921721 is 12712954.

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 45921721 - 2¹ = 45921719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45921751) 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, 7195 + ... + 11983.

It is an arithmetic number, because the mean of its divisors is an integer number (5901280).

Almost surely, 2^45921721 is an apocalyptic number.

It is an amenable number.

45921721 is a deficient number, since it is larger than the sum of its proper divisors (1288519).

45921721 is a wasteful number, since it uses less digits than its factorization.

45921721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055.

The product of its digits is 5040, while the sum is 31.

The square root of 45921721 is about 6776.5567215216. The cubic root of 45921721 is about 358.1014272084.

The spelling of 45921721 in words is "forty-five million, nine hundred twenty-one thousand, seven hundred twenty-one".