1221340233 has 4 divisors (see below), whose sum is σ = 1628453648. Its totient is φ = 814226820.

The previous prime is 1221340217. The next prime is 1221340243. The reversal of 1221340233 is 3320431221.

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 an emirpimes, since its reverse is a distinct semiprime: 3320431221 = 3 ⋅1106810407.

It is not a de Polignac number, because 1221340233 - 2⁴ = 1221340217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221340213) 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, 203556703 + ... + 203556708.

It is an arithmetic number, because the mean of its divisors is an integer number (407113412).

Almost surely, 2^1221340233 is an apocalyptic number.

It is an amenable number.

1221340233 is a deficient number, since it is larger than the sum of its proper divisors (407113415).

1221340233 is an equidigital number, since it uses as much as digits as its factorization.

1221340233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407113414.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1221340233 is about 34947.6785065904. The cubic root of 1221340233 is about 1068.9208653187.

Adding to 1221340233 its reverse (3320431221), we get a palindrome (4541771454).

The spelling of 1221340233 in words is "one billion, two hundred twenty-one million, three hundred forty thousand, two hundred thirty-three".