21210211220012 has 12 divisors (see below), whose sum is σ = 37179629821656. Its totient is φ = 10587459842400.

The previous prime is 21210211219999. The next prime is 21210211220069. The reversal of 21210211220012 is 21002211201212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4411439198 + ... + 4411444005.

It is an arithmetic number, because the mean of its divisors is an integer number (3098302485138).

Almost surely, 2^{21210211220012} is an apocalyptic number.

It is an amenable number.

21210211220012 is a deficient number, since it is larger than the sum of its proper divisors (15969418601644).

21210211220012 is a wasteful number, since it uses less digits than its factorization.

21210211220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822883808 (or 8822883806 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210211220012 its reverse (21002211201212), we get a palindrome (42212422421224).

The spelling of 21210211220012 in words is "twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty thousand, twelve".