45215621 has 8 divisors (see below), whose sum is σ = 49586688. Its totient is φ = 40888000.

The previous prime is 45215609. The next prime is 45215623. The reversal of 45215621 is 12651254.

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 45215621 - 2¹⁰ = 45214597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45215623) 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, 8660 + ... + 12861.

It is an arithmetic number, because the mean of its divisors is an integer number (6198336).

Almost surely, 2^45215621 is an apocalyptic number.

It is an amenable number.

45215621 is a deficient number, since it is larger than the sum of its proper divisors (4371067).

45215621 is a wasteful number, since it uses less digits than its factorization.

45215621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21723.

The product of its digits is 2400, while the sum is 26.

The square root of 45215621 is about 6724.2561670418. The cubic root of 45215621 is about 356.2565298485.

Adding to 45215621 its reverse (12651254), we get a palindrome (57866875).

The spelling of 45215621 in words is "forty-five million, two hundred fifteen thousand, six hundred twenty-one".