21011100202100 has 36 divisors (see below), whose sum is σ = 45758687092524. Its totient is φ = 8374099130880.

The previous prime is 21011100202021. The next prime is 21011100202151. The reversal of 21011100202100 is 120200111012.

It can be written as a sum of positive squares in 6 ways, for example, as 7643433384976 + 13367666817124 = 2764676^2 + 3656182^2 .

It is a congruent number.

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, 379234037 + ... + 379289436.

It is an arithmetic number, because the mean of its divisors is an integer number (1271074641459).

Almost surely, 2^{21011100202100} is an apocalyptic number.

21011100202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011100202100 is an abundant number, since it is smaller than the sum of its proper divisors (24747586890424).

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

21011100202100 is a wasteful number, since it uses less digits than its factorization.

21011100202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758523764 (or 758523757 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011100202100 its reverse (120200111012), we get a palindrome (21131300313112).

The spelling of 21011100202100 in words is "twenty-one trillion, eleven billion, one hundred million, two hundred two thousand, one hundred".