1452020221 has 4 divisors (see below), whose sum is σ = 1452099712. Its totient is φ = 1451940732.

The previous prime is 1452020197. The next prime is 1452020231. The reversal of 1452020221 is 1220202541.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1220202541 = 59 ⋅20681399.

It is a cyclic number.

It is not a de Polignac number, because 1452020221 - 2⁵ = 1452020189 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 (1452020231) 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, 2926 + ... + 53968.

It is an arithmetic number, because the mean of its divisors is an integer number (363024928).

Almost surely, 2^1452020221 is an apocalyptic number.

It is an amenable number.

1452020221 is a deficient number, since it is larger than the sum of its proper divisors (79491).

1452020221 is an equidigital number, since it uses as much as digits as its factorization.

1452020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79490.

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

The square root of 1452020221 is about 38105.3830974050. The cubic root of 1452020221 is about 1132.3766048001.

Adding to 1452020221 its reverse (1220202541), we get a palindrome (2672222762).

The spelling of 1452020221 in words is "one billion, four hundred fifty-two million, twenty thousand, two hundred twenty-one".