1421222261 has 2 divisors, whose sum is σ = 1421222262. Its totient is φ = 1421222260.

The previous prime is 1421222203. The next prime is 1421222263. The reversal of 1421222261 is 1622221241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1419028900 + 2193361 = 37670^2 + 1481^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421222261 - 2¹⁸ = 1420960117 is a prime.

Together with 1421222263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421222263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710611130 + 710611131.

It is an arithmetic number, because the mean of its divisors is an integer number (710611131).

Almost surely, 2^1421222261 is an apocalyptic number.

It is an amenable number.

1421222261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421222261 is an equidigital number, since it uses as much as digits as its factorization.

1421222261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 1421222261 is about 37699.1015940699. The cubic root of 1421222261 is about 1124.3132627877.

The spelling of 1421222261 in words is "one billion, four hundred twenty-one million, two hundred twenty-two thousand, two hundred sixty-one".