1223491421 has 2 divisors, whose sum is σ = 1223491422. Its totient is φ = 1223491420.

The previous prime is 1223491403. The next prime is 1223491439. The reversal of 1223491421 is 1241943221.

It is a balanced prime because it is at equal distance from previous prime (1223491403) and next prime (1223491439).

It can be written as a sum of positive squares in only one way, i.e., 1182672100 + 40819321 = 34390^2 + 6389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223491421 - 2²² = 1219297117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223491441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611745710 + 611745711.

It is an arithmetic number, because the mean of its divisors is an integer number (611745711).

Almost surely, 2^1223491421 is an apocalyptic number.

It is an amenable number.

1223491421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223491421 is an equidigital number, since it uses as much as digits as its factorization.

1223491421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 1223491421 is about 34978.4422323236. The cubic root of 1223491421 is about 1069.5480727538.

The spelling of 1223491421 in words is "one billion, two hundred twenty-three million, four hundred ninety-one thousand, four hundred twenty-one".