21101212200 has 48 divisors (see below), whose sum is σ = 65413759680. Its totient is φ = 5626989760.

The previous prime is 21101212157. The next prime is 21101212217. The reversal of 21101212200 is 221210112.

It is a super-2 number, since 2×21101212200² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17583744 + ... + 17584943.

It is an arithmetic number, because the mean of its divisors is an integer number (1362786660).

Almost surely, 2^21101212200 is an apocalyptic number.

21101212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101212200 is an abundant number, since it is smaller than the sum of its proper divisors (44312547480).

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

21101212200 is a wasteful number, since it uses less digits than its factorization.

21101212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35168706 (or 35168697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101212200 its reverse (221210112), we get a palindrome (21322422312).

The spelling of 21101212200 in words is "twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred".