45124021 has 2 divisors, whose sum is σ = 45124022. Its totient is φ = 45124020.

The previous prime is 45124007. The next prime is 45124033. The reversal of 45124021 is 12042154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 46225 = 6714^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 45124021 - 2⁷ = 45123893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45124021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45124061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22562010 + 22562011.

It is an arithmetic number, because the mean of its divisors is an integer number (22562011).

Almost surely, 2^45124021 is an apocalyptic number.

It is an amenable number.

45124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

45124021 is an equidigital number, since it uses as much as digits as its factorization.

45124021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 45124021 is about 6717.4415516624. The cubic root of 45124021 is about 356.0157932858.

Adding to 45124021 its reverse (12042154), we get a palindrome (57166175).

The spelling of 45124021 in words is "forty-five million, one hundred twenty-four thousand, twenty-one".