21012022200 has 96 divisors (see below), whose sum is σ = 70147854000. Its totient is φ = 5172188160.

The previous prime is 21012022189. The next prime is 21012022201. The reversal of 21012022200 is 222021012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012022201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1339125 + ... + 1354724.

Almost surely, 2^21012022200 is an apocalyptic number.

21012022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012022200 is an abundant number, since it is smaller than the sum of its proper divisors (49135831800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012022200 is a wasteful number, since it uses less digits than its factorization.

21012022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693881 (or 2693872 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21012022200 its reverse (222021012), we get a palindrome (21234043212).

The spelling of 21012022200 in words is "twenty-one billion, twelve million, twenty-two thousand, two hundred".