7216390121 has 2 divisors, whose sum is σ = 7216390122. Its totient is φ = 7216390120.

The previous prime is 7216390117. The next prime is 7216390141. The reversal of 7216390121 is 1210936127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6502164496 + 714225625 = 80636^2 + 26725^2 .

It is a cyclic number.

It is not a de Polignac number, because 7216390121 - 2² = 7216390117 is a prime.

It is not a weakly prime, because it can be changed into another prime (7216390141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3608195060 + 3608195061.

It is an arithmetic number, because the mean of its divisors is an integer number (3608195061).

Almost surely, 2^7216390121 is an apocalyptic number.

It is an amenable number.

7216390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7216390121 is an equidigital number, since it uses as much as digits as its factorization.

7216390121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7216390121 is about 84949.3385554002. The cubic root of 7216390121 is about 1932.4428891510.

The spelling of 7216390121 in words is "seven billion, two hundred sixteen million, three hundred ninety thousand, one hundred twenty-one".