45211721 has 8 divisors (see below), whose sum is σ = 49953024. Its totient is φ = 40701760.

The previous prime is 45211717. The next prime is 45211723. The reversal of 45211721 is 12711254.

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 45211721 - 2² = 45211717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45211723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57425 + ... + 58206.

It is an arithmetic number, because the mean of its divisors is an integer number (6244128).

Almost surely, 2^45211721 is an apocalyptic number.

It is an amenable number.

45211721 is a deficient number, since it is larger than the sum of its proper divisors (4741303).

45211721 is a wasteful number, since it uses less digits than its factorization.

45211721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115671.

The product of its digits is 560, while the sum is 23.

The square root of 45211721 is about 6723.9661658875. The cubic root of 45211721 is about 356.2462867778.

Adding to 45211721 its reverse (12711254), we get a palindrome (57922975).

The spelling of 45211721 in words is "forty-five million, two hundred eleven thousand, seven hundred twenty-one".