21323211197 has 16 divisors (see below), whose sum is σ = 23843030400. Its totient is φ = 18965033472.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211197 is 79111232312.

It is a cyclic number.

It is not a de Polignac number, because 21323211197 - 2⁸ = 21323210941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323211191) 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, 296072 + ... + 360977.

It is an arithmetic number, because the mean of its divisors is an integer number (1490189400).

Almost surely, 2^21323211197 is an apocalyptic number.

It is an amenable number.

21323211197 is a deficient number, since it is larger than the sum of its proper divisors (2519819203).

21323211197 is a wasteful number, since it uses less digits than its factorization.

21323211197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657172.

The product of its digits is 4536, while the sum is 32.

The spelling of 21323211197 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, one hundred ninety-seven".