1221221212037 has 2 divisors, whose sum is σ = 1221221212038. Its totient is φ = 1221221212036.

The previous prime is 1221221212007. The next prime is 1221221212039. The reversal of 1221221212037 is 7302121221221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187749045921 + 33472166116 = 1089839^2 + 182954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221221212037 - 2⁸ = 1221221211781 is a prime.

Together with 1221221212039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221221211997 and 1221221212015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221221212039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610606018 + 610610606019.

It is an arithmetic number, because the mean of its divisors is an integer number (610610606019).

Almost surely, 2^{1221221212037} is an apocalyptic number.

It is an amenable number.

1221221212037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221212037 is an equidigital number, since it uses as much as digits as its factorization.

1221221212037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 1221221212037 its reverse (7302121221221), we get a palindrome (8523342433258).

The spelling of 1221221212037 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, thirty-seven".