21011201202100 has 18 divisors (see below), whose sum is σ = 45594306608774. Its totient is φ = 8404480480800.

The previous prime is 21011201202097. The next prime is 21011201202119. The reversal of 21011201202100 is 120210211012.

It can be written as a sum of positive squares in 3 ways, for example, as 817555939344 + 20193645262756 = 904188^2 + 4493734^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105056005911 + ... + 105056006110.

Almost surely, 2^{21011201202100} is an apocalyptic number.

21011201202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011201202100 is an abundant number, since it is smaller than the sum of its proper divisors (24583105406674).

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

21011201202100 is a wasteful number, since it uses less digits than its factorization.

21011201202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210112012035 (or 210112012028 counting only the distinct ones).

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

Adding to 21011201202100 its reverse (120210211012), we get a palindrome (21131411413112).

The spelling of 21011201202100 in words is "twenty-one trillion, eleven billion, two hundred one million, two hundred two thousand, one hundred".