21012201212 has 48 divisors (see below), whose sum is σ = 39215780352. Its totient is φ = 9816871680.

The previous prime is 21012201211. The next prime is 21012201271. The reversal of 21012201212 is 21210221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012201211) 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, 6641543 + ... + 6644705.

It is an arithmetic number, because the mean of its divisors is an integer number (816995424).

Almost surely, 2^21012201212 is an apocalyptic number.

It is an amenable number.

21012201212 is a deficient number, since it is larger than the sum of its proper divisors (18203579140).

21012201212 is a wasteful number, since it uses less digits than its factorization.

21012201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858 (or 3856 counting only the distinct ones).

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

Adding to 21012201212 its reverse (21210221012), we get a palindrome (42222422224).

The spelling of 21012201212 in words is "twenty-one billion, twelve million, two hundred one thousand, two hundred twelve".