21323211212 has 6 divisors (see below), whose sum is σ = 37315619628. Its totient is φ = 10661605604.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211212 is 21211232312.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665401398 + ... + 2665401405.

It is an arithmetic number, because the mean of its divisors is an integer number (6219269938).

Almost surely, 2^21323211212 is an apocalyptic number.

It is an amenable number.

21323211212 is a deficient number, since it is larger than the sum of its proper divisors (15992408416).

21323211212 is a wasteful number, since it uses less digits than its factorization.

21323211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330802807 (or 5330802805 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21323211212 its reverse (21211232312), we get a palindrome (42534443524).

The spelling of 21323211212 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred twelve".