21201201212 has 24 divisors (see below), whose sum is σ = 37208371200. Its totient is φ = 10570268016.

The previous prime is 21201201199. The next prime is 21201201221. The reversal of 21201201212 is 21210210212.

It is a congruent number.

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, 5095589 + ... + 5099747.

It is an arithmetic number, because the mean of its divisors is an integer number (1550348800).

Almost surely, 2^21201201212 is an apocalyptic number.

It is an amenable number.

21201201212 is a deficient number, since it is larger than the sum of its proper divisors (16007169988).

21201201212 is a wasteful number, since it uses less digits than its factorization.

21201201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505 (or 7503 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201201212 its reverse (21210210212), we get a palindrome (42411411424).

The spelling of 21201201212 in words is "twenty-one billion, two hundred one million, two hundred one thousand, two hundred twelve".