1221451401 has 4 divisors (see below), whose sum is σ = 1628601872. Its totient is φ = 814300932.

The previous prime is 1221451393. The next prime is 1221451447. The reversal of 1221451401 is 1041541221.

1221451401 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 1221451401 - 2³ = 1221451393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221451481) 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, 203575231 + ... + 203575236.

It is an arithmetic number, because the mean of its divisors is an integer number (407150468).

Almost surely, 2^1221451401 is an apocalyptic number.

It is an amenable number.

1221451401 is a deficient number, since it is larger than the sum of its proper divisors (407150471).

1221451401 is an equidigital number, since it uses as much as digits as its factorization.

1221451401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407150470.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1221451401 is about 34949.2689623116. The cubic root of 1221451401 is about 1068.9532958641.

Adding to 1221451401 its reverse (1041541221), we get a palindrome (2262992622).

The spelling of 1221451401 in words is "one billion, two hundred twenty-one million, four hundred fifty-one thousand, four hundred one".