1234161221 has 4 divisors (see below), whose sum is σ = 1234263744. Its totient is φ = 1234058700.

The previous prime is 1234161217. The next prime is 1234161251. The reversal of 1234161221 is 1221614321.

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: 1221614321 = 5021 ⋅243301.

It is a cyclic number.

It is not a de Polignac number, because 1234161221 - 2² = 1234161217 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 (1234161251) 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, 30365 + ... + 58226.

It is an arithmetic number, because the mean of its divisors is an integer number (308565936).

Almost surely, 2^1234161221 is an apocalyptic number.

It is an amenable number.

1234161221 is a deficient number, since it is larger than the sum of its proper divisors (102523).

1234161221 is an equidigital number, since it uses as much as digits as its factorization.

1234161221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102522.

The product of its digits is 576, while the sum is 23.

The square root of 1234161221 is about 35130.6308084555. The cubic root of 1234161221 is about 1072.6481763238.

Adding to 1234161221 its reverse (1221614321), we get a palindrome (2455775542).

The spelling of 1234161221 in words is "one billion, two hundred thirty-four million, one hundred sixty-one thousand, two hundred twenty-one".