45121221 has 12 divisors (see below), whose sum is σ = 65253760. Its totient is φ = 30044520.

The previous prime is 45121211. The next prime is 45121231. The reversal of 45121221 is 12212154.

45121221 is a `hidden beast` number, since 451 + 212 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (45121211) and next prime (45121231).

It is not a de Polignac number, because 45121221 - 2⁵ = 45121189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45121194 and 45121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45121201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6390 + ... + 11448.

Almost surely, 2^45121221 is an apocalyptic number.

It is an amenable number.

45121221 is a deficient number, since it is larger than the sum of its proper divisors (20132539).

45121221 is a wasteful number, since it uses less digits than its factorization.

45121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6056 (or 6053 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 45121221 is about 6717.2331357487. The cubic root of 45121221 is about 356.0084293968.

Adding to 45121221 its reverse (12212154), we get a palindrome (57333375).

The spelling of 45121221 in words is "forty-five million, one hundred twenty-one thousand, two hundred twenty-one".