21206466111 has 32 divisors (see below), whose sum is σ = 30747859200. Its totient is φ = 12950796800.

The previous prime is 21206466107. The next prime is 21206466157. The reversal of 21206466111 is 11166460212.

It is a cyclic number.

It is not a de Polignac number, because 21206466111 - 2² = 21206466107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21206466101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269020 + ... + 338798.

It is an arithmetic number, because the mean of its divisors is an integer number (960870600).

Almost surely, 2^21206466111 is an apocalyptic number.

21206466111 is a deficient number, since it is larger than the sum of its proper divisors (9541393089).

21206466111 is a wasteful number, since it uses less digits than its factorization.

21206466111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69959.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21206466111 in words is "twenty-one billion, two hundred six million, four hundred sixty-six thousand, one hundred eleven".