21132346666 has 16 divisors (see below), whose sum is σ = 32490025344. Its totient is φ = 10304726224.

The previous prime is 21132346637. The next prime is 21132346679. The reversal of 21132346666 is 66664323112.

It is a happy number.

It is a super-2 number, since 2×21132346666² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579190 + ... + 614593.

It is an arithmetic number, because the mean of its divisors is an integer number (2030626584).

Almost surely, 2^21132346666 is an apocalyptic number.

21132346666 is a deficient number, since it is larger than the sum of its proper divisors (11357678678).

21132346666 is a wasteful number, since it uses less digits than its factorization.

21132346666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194005.

The product of its digits is 186624, while the sum is 40.

Adding to 21132346666 its reverse (66664323112), we get a palindrome (87796669778).

The spelling of 21132346666 in words is "twenty-one billion, one hundred thirty-two million, three hundred forty-six thousand, six hundred sixty-six".