21201200012 has 6 divisors (see below), whose sum is σ = 37102100028. Its totient is φ = 10600600004.

The previous prime is 21201200011. The next prime is 21201200047. The reversal of 21201200012 is 21000210212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21201199966 and 21201200002.

It is not an unprimeable number, because it can be changed into a prime (21201200011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650149998 + ... + 2650150005.

It is an arithmetic number, because the mean of its divisors is an integer number (6183683338).

Almost surely, 2^21201200012 is an apocalyptic number.

It is an amenable number.

21201200012 is a deficient number, since it is larger than the sum of its proper divisors (15900900016).

21201200012 is a wasteful number, since it uses less digits than its factorization.

21201200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300300007 (or 5300300005 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201200012 its reverse (21000210212), we get a palindrome (42201410224).

The spelling of 21201200012 in words is "twenty-one billion, two hundred one million, two hundred thousand, twelve".