21100223212 has 6 divisors (see below), whose sum is σ = 36925390628. Its totient is φ = 10550111604.

The previous prime is 21100223203. The next prime is 21100223219. The reversal of 21100223212 is 21232200112.

It is a happy number.

It is a super-3 number, since 3×21100223212³ (a number of 32 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 2637527898 + ... + 2637527905.

Almost surely, 2^21100223212 is an apocalyptic number.

It is an amenable number.

21100223212 is a deficient number, since it is larger than the sum of its proper divisors (15825167416).

21100223212 is a wasteful number, since it uses less digits than its factorization.

21100223212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275055807 (or 5275055805 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21100223212 its reverse (21232200112), we get a palindrome (42332423324).

The spelling of 21100223212 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, two hundred twelve".