1227453221 has 4 divisors (see below), whose sum is σ = 1228332000. Its totient is φ = 1226574444.

The previous prime is 1227453197. The next prime is 1227453239. The reversal of 1227453221 is 1223547221.

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 1227453221 - 2²⁶ = 1160344357 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 (1227453421) 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, 437291 + ... + 440088.

It is an arithmetic number, because the mean of its divisors is an integer number (307083000).

Almost surely, 2^1227453221 is an apocalyptic number.

It is an amenable number.

1227453221 is a deficient number, since it is larger than the sum of its proper divisors (878779).

1227453221 is an equidigital number, since it uses as much as digits as its factorization.

1227453221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878778.

The product of its digits is 6720, while the sum is 29.

The square root of 1227453221 is about 35035.0284857883. The cubic root of 1227453221 is about 1070.7012670847.

The spelling of 1227453221 in words is "one billion, two hundred twenty-seven million, four hundred fifty-three thousand, two hundred twenty-one".