1231355221611 has 8 divisors (see below), whose sum is σ = 1694768477184. Its totient is φ = 794422723560.

The previous prime is 1231355221609. The next prime is 1231355221633. The reversal of 1231355221611 is 1161225531321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231355221611 - 2¹ = 1231355221609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231355221111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6620189271 + ... + 6620189456.

It is an arithmetic number, because the mean of its divisors is an integer number (211846059648).

Almost surely, 2^{1231355221611} is an apocalyptic number.

1231355221611 is a deficient number, since it is larger than the sum of its proper divisors (463413255573).

1231355221611 is a wasteful number, since it uses less digits than its factorization.

1231355221611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13240378761.

The product of its digits is 10800, while the sum is 33.

The spelling of 1231355221611 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-five million, two hundred twenty-one thousand, six hundred eleven".