21100223210 has 32 divisors (see below), whose sum is σ = 41775614784. Its totient is φ = 7672803600.

The previous prime is 21100223203. The next prime is 21100223219. The reversal of 21100223210 is 1232200112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21100223219) 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, 779336 + ... + 805955.

It is an arithmetic number, because the mean of its divisors is an integer number (1305487962).

Almost surely, 2^21100223210 is an apocalyptic number.

21100223210 is a deficient number, since it is larger than the sum of its proper divisors (20675391574).

21100223210 is a wasteful number, since it uses less digits than its factorization.

21100223210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585331 (or 1585309 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21100223210 its reverse (1232200112), we get a palindrome (22332423322).

The spelling of 21100223210 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, two hundred ten".