21200311228 has 6 divisors (see below), whose sum is σ = 37100544656. Its totient is φ = 10600155612.

The previous prime is 21200311213. The next prime is 21200311229. The reversal of 21200311228 is 82211300212.

It is a junction number, because it is equal to n+sod(n) for n = 21200311199 and 21200311208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200311229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650038900 + ... + 2650038907.

Almost surely, 2^21200311228 is an apocalyptic number.

It is an amenable number.

21200311228 is a deficient number, since it is larger than the sum of its proper divisors (15900233428).

21200311228 is a wasteful number, since it uses less digits than its factorization.

21200311228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300077811 (or 5300077809 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 21200311228 in words is "twenty-one billion, two hundred million, three hundred eleven thousand, two hundred twenty-eight".