1226711621 has 2 divisors, whose sum is σ = 1226711622. Its totient is φ = 1226711620.

The previous prime is 1226711593. The next prime is 1226711623. The reversal of 1226711621 is 1261176221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626951521 + 599760100 = 25039^2 + 24490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226711621 - 2¹⁴ = 1226695237 is a prime.

Together with 1226711623, 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 (1226711623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613355810 + 613355811.

It is an arithmetic number, because the mean of its divisors is an integer number (613355811).

Almost surely, 2^1226711621 is an apocalyptic number.

It is an amenable number.

1226711621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226711621 is an equidigital number, since it uses as much as digits as its factorization.

1226711621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 1226711621 is about 35024.4431932900. The cubic root of 1226711621 is about 1070.4855923277.

Adding to 1226711621 its reverse (1261176221), we get a palindrome (2487887842).

The spelling of 1226711621 in words is "one billion, two hundred twenty-six million, seven hundred eleven thousand, six hundred twenty-one".