21102201212 has 12 divisors (see below), whose sum is σ = 36937102776. Its totient is φ = 10548743280.

The previous prime is 21102201187. The next prime is 21102201217. The reversal of 21102201212 is 21210220112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102201217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569114 + ... + 605057.

It is an arithmetic number, because the mean of its divisors is an integer number (3078091898).

Almost surely, 2^21102201212 is an apocalyptic number.

It is an amenable number.

21102201212 is a deficient number, since it is larger than the sum of its proper divisors (15834901564).

21102201212 is a wasteful number, since it uses less digits than its factorization.

21102201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178668 (or 1178666 counting only the distinct ones).

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

Adding to 21102201212 its reverse (21210220112), we get a palindrome (42312421324).

The spelling of 21102201212 in words is "twenty-one billion, one hundred two million, two hundred one thousand, two hundred twelve".