1216937716201 has 9 divisors (see below), whose sum is σ = 1272175025149. Its totient is φ = 1164003111436.

The previous prime is 1216937716199. The next prime is 1216937716213. The reversal of 1216937716201 is 1026177396121.

The square root of 1216937716201 is 1103149.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1216937716201 - 2¹ = 1216937716199 is a prime.

It is a super-2 number, since 2×1216937716201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216937716601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25348446 + ... + 25396408.

Almost surely, 2^{1216937716201} is an apocalyptic number.

1216937716201 is the 1103149-th square number.

1216937716201 is the 551575-th centered octagonal number.

It is an amenable number.

1216937716201 is a deficient number, since it is larger than the sum of its proper divisors (55237308948).

1216937716201 is an frugal number, since it uses more digits than its factorization.

1216937716201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95972 (or 47986 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 1216937716201 in words is "one trillion, two hundred sixteen billion, nine hundred thirty-seven million, seven hundred sixteen thousand, two hundred one".