1221346037 has 2 divisors, whose sum is σ = 1221346038. Its totient is φ = 1221346036.

The previous prime is 1221345989. The next prime is 1221346051. The reversal of 1221346037 is 7306431221.

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., 1153349521 + 67996516 = 33961^2 + 8246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221346037 - 2¹² = 1221341941 is a prime.

It is a super-2 number, since 2×1221346037² = 2983372284191210738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221346067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610673018 + 610673019.

It is an arithmetic number, because the mean of its divisors is an integer number (610673019).

Almost surely, 2^1221346037 is an apocalyptic number.

It is an amenable number.

1221346037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221346037 is an equidigital number, since it uses as much as digits as its factorization.

1221346037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 1221346037 is about 34947.7615449116. The cubic root of 1221346037 is about 1068.9225585424.

Adding to 1221346037 its reverse (7306431221), we get a palindrome (8527777258).

The spelling of 1221346037 in words is "one billion, two hundred twenty-one million, three hundred forty-six thousand, thirty-seven".