45136021 has 4 divisors (see below), whose sum is σ = 51584032. Its totient is φ = 38688012.

The previous prime is 45136009. The next prime is 45136073. The reversal of 45136021 is 12063154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45136021 - 2⁵ = 45135989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45135983 and 45136001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45136081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3223995 + ... + 3224008.

It is an arithmetic number, because the mean of its divisors is an integer number (12896008).

Almost surely, 2^45136021 is an apocalyptic number.

It is an amenable number.

45136021 is a deficient number, since it is larger than the sum of its proper divisors (6448011).

45136021 is an equidigital number, since it uses as much as digits as its factorization.

45136021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6448010.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 45136021 is about 6718.3346894897. The cubic root of 45136021 is about 356.0473493600.

Adding to 45136021 its reverse (12063154), we get a palindrome (57199175).

The spelling of 45136021 in words is "forty-five million, one hundred thirty-six thousand, twenty-one".