21323211206 has 24 divisors (see below), whose sum is σ = 37007234040. Its totient is φ = 9182242080.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211206 is 60211232312.

It is a super-2 number, since 2×21323211206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2314151 + ... + 2323346.

It is an arithmetic number, because the mean of its divisors is an integer number (1541968085).

Almost surely, 2^21323211206 is an apocalyptic number.

21323211206 is a deficient number, since it is larger than the sum of its proper divisors (15684022834).

21323211206 is a wasteful number, since it uses less digits than its factorization.

21323211206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4637540 (or 4637529 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21323211206 its reverse (60211232312), we get a palindrome (81534443518).

The spelling of 21323211206 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred six".