1221201211037 has 2 divisors, whose sum is σ = 1221201211038. Its totient is φ = 1221201211036.

The previous prime is 1221201210991. The next prime is 1221201211039. The reversal of 1221201211037 is 7301121021221.

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., 1193383641241 + 27817569796 = 1092421^2 + 166786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221201211037 - 2²² = 1221197016733 is a prime.

Together with 1221201211039, 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 (1221201211039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600605518 + 610600605519.

It is an arithmetic number, because the mean of its divisors is an integer number (610600605519).

Almost surely, 2^{1221201211037} is an apocalyptic number.

It is an amenable number.

1221201211037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201211037 is an equidigital number, since it uses as much as digits as its factorization.

1221201211037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 1221201211037 its reverse (7301121021221), we get a palindrome (8522322232258).

The spelling of 1221201211037 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, thirty-seven".