2311721221636 has 24 divisors (see below), whose sum is σ = 4366969629120. Its totient is φ = 1067481462432.

The previous prime is 2311721221609. The next prime is 2311721221651. The reversal of 2311721221636 is 6361221271132.

It is a junction number, because it is equal to n+sod(n) for n = 2311721221595 and 2311721221604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433228446 + ... + 433233781.

It is an arithmetic number, because the mean of its divisors is an integer number (181957067880).

Almost surely, 2^{2311721221636} is an apocalyptic number.

It is an amenable number.

2311721221636 is a deficient number, since it is larger than the sum of its proper divisors (2055248407484).

2311721221636 is a wasteful number, since it uses less digits than its factorization.

2311721221636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866462283 (or 866462281 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

Adding to 2311721221636 its reverse (6361221271132), we get a palindrome (8672942492768).

The spelling of 2311721221636 in words is "two trillion, three hundred eleven billion, seven hundred twenty-one million, two hundred twenty-one thousand, six hundred thirty-six".