1201200109621 has 2 divisors, whose sum is σ = 1201200109622. Its totient is φ = 1201200109620.

The previous prime is 1201200109607. The next prime is 1201200109633. The reversal of 1201200109621 is 1269010021021.

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., 1167294411396 + 33905698225 = 1080414^2 + 184135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201200109621 - 2¹¹ = 1201200107573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201200109651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600054810 + 600600054811.

It is an arithmetic number, because the mean of its divisors is an integer number (600600054811).

Almost surely, 2^{1201200109621} is an apocalyptic number.

It is an amenable number.

1201200109621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201200109621 is an equidigital number, since it uses as much as digits as its factorization.

1201200109621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1201200109621 in words is "one trillion, two hundred one billion, two hundred million, one hundred nine thousand, six hundred twenty-one".