1221201937 has 2 divisors, whose sum is σ = 1221201938. Its totient is φ = 1221201936.

The previous prime is 1221201931. The next prime is 1221201959. The reversal of 1221201937 is 7391021221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1165266496 + 55935441 = 34136^2 + 7479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221201937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221201931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600968 + 610600969.

It is an arithmetic number, because the mean of its divisors is an integer number (610600969).

Almost surely, 2^1221201937 is an apocalyptic number.

It is an amenable number.

1221201937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201937 is an equidigital number, since it uses as much as digits as its factorization.

1221201937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1221201937 is about 34945.6998356021. The cubic root of 1221201937 is about 1068.8805180957.

The spelling of 1221201937 in words is "one billion, two hundred twenty-one million, two hundred one thousand, nine hundred thirty-seven".