1216245435226 has 4 divisors (see below), whose sum is σ = 1824368152842. Its totient is φ = 608122717612.

The previous prime is 1216245435221. The next prime is 1216245435239. The reversal of 1216245435226 is 6225345426121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1199022810001 + 17222625225 = 1094999^2 + 131235^2 .

It is not an unprimeable number, because it can be changed into a prime (1216245435221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304061358805 + ... + 304061358808.

Almost surely, 2^{1216245435226} is an apocalyptic number.

1216245435226 is a deficient number, since it is larger than the sum of its proper divisors (608122717616).

1216245435226 is an equidigital number, since it uses as much as digits as its factorization.

1216245435226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608122717615.

The product of its digits is 691200, while the sum is 43.

The spelling of 1216245435226 in words is "one trillion, two hundred sixteen billion, two hundred forty-five million, four hundred thirty-five thousand, two hundred twenty-six".