21201202011100 has 36 divisors (see below), whose sum is σ = 46047576202264. Its totient is φ = 8472929129280.

The previous prime is 21201202011089. The next prime is 21201202011103. The reversal of 21201202011100 is 111020210212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201202011103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94283079 + ... + 94507678.

Almost surely, 2^{21201202011100} is an apocalyptic number.

21201202011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201202011100 is an abundant number, since it is smaller than the sum of its proper divisors (24846374191164).

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

21201202011100 is a wasteful number, since it uses less digits than its factorization.

21201202011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188791894 (or 188791887 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201202011100 its reverse (111020210212), we get a palindrome (21312222221312).

The spelling of 21201202011100 in words is "twenty-one trillion, two hundred one billion, two hundred two million, eleven thousand, one hundred".