21112307611 has 16 divisors (see below), whose sum is σ = 21887308800. Its totient is φ = 20343391200.

The previous prime is 21112307597. The next prime is 21112307621. The reversal of 21112307611 is 11670321112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112307611 is a prime.

It is a super-2 number, since 2×21112307611² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112307621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8584500 + ... + 8586958.

It is an arithmetic number, because the mean of its divisors is an integer number (1367956800).

Almost surely, 2^21112307611 is an apocalyptic number.

21112307611 is a deficient number, since it is larger than the sum of its proper divisors (775001189).

21112307611 is a wasteful number, since it uses less digits than its factorization.

21112307611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 21112307611 its reverse (11670321112), we get a palindrome (32782628723).

The spelling of 21112307611 in words is "twenty-one billion, one hundred twelve million, three hundred seven thousand, six hundred eleven".