21100323212 has 24 divisors (see below), whose sum is σ = 37296694176. Its totient is φ = 10444347648.

The previous prime is 21100323203. The next prime is 21100323239. The reversal of 21100323212 is 21232300112.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 358193 + ... + 412919.

It is an arithmetic number, because the mean of its divisors is an integer number (1554028924).

Almost surely, 2^21100323212 is an apocalyptic number.

It is an amenable number.

21100323212 is a deficient number, since it is larger than the sum of its proper divisors (16196370964).

21100323212 is a wasteful number, since it uses less digits than its factorization.

21100323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55697 (or 55695 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21100323212 its reverse (21232300112), we get a palindrome (42332623324).

The spelling of 21100323212 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, two hundred twelve".