21000201100 has 36 divisors (see below), whose sum is σ = 45670252264. Its totient is φ = 8381681280.

The previous prime is 21000200993. The next prime is 21000201113. The reversal of 21000201100 is 110200012.

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, 184062 + ... + 275461.

Almost surely, 2^21000201100 is an apocalyptic number.

21000201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000201100 is an abundant number, since it is smaller than the sum of its proper divisors (24670051164).

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

21000201100 is a wasteful number, since it uses less digits than its factorization.

21000201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459994 (or 459987 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000201100 its reverse (110200012), we get a palindrome (21110401112).

The spelling of 21000201100 in words is "twenty-one billion, two hundred one thousand, one hundred".