45220421 has 4 divisors (see below), whose sum is σ = 45235872. Its totient is φ = 45204972.

The previous prime is 45220387. The next prime is 45220429. The reversal of 45220421 is 12402254.

It is a happy number.

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 45220421 - 2¹⁰ = 45219397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45220393 and 45220402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45220429) 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, 1841 + ... + 9686.

It is an arithmetic number, because the mean of its divisors is an integer number (11308968).

Almost surely, 2^45220421 is an apocalyptic number.

It is an amenable number.

45220421 is a deficient number, since it is larger than the sum of its proper divisors (15451).

45220421 is a wasteful number, since it uses less digits than its factorization.

45220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15450.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 45220421 is about 6724.6130743709. The cubic root of 45220421 is about 356.2691358963.

Adding to 45220421 its reverse (12402254), we get a palindrome (57622675).

The spelling of 45220421 in words is "forty-five million, two hundred twenty thousand, four hundred twenty-one".