1215545224011 has 4 divisors (see below), whose sum is σ = 1620726965352. Its totient is φ = 810363482672.

The previous prime is 1215545223941. The next prime is 1215545224043. The reversal of 1215545224011 is 1104225455121.

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

It is a cyclic number.

It is not a de Polignac number, because 1215545224011 - 2⁷ = 1215545223883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215545222011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202590870666 + ... + 202590870671.

It is an arithmetic number, because the mean of its divisors is an integer number (405181741338).

Almost surely, 2^{1215545224011} is an apocalyptic number.

1215545224011 is a deficient number, since it is larger than the sum of its proper divisors (405181741341).

1215545224011 is an equidigital number, since it uses as much as digits as its factorization.

1215545224011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405181741340.

The product of its (nonzero) digits is 16000, while the sum is 33.

The spelling of 1215545224011 in words is "one trillion, two hundred fifteen billion, five hundred forty-five million, two hundred twenty-four thousand, eleven".