21031002202100 has 144 divisors (see below), whose sum is σ = 50473401120576. Its totient is φ = 7542383616000.

The previous prime is 21031002202069. The next prime is 21031002202153. The reversal of 21031002202100 is 120220013012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52480490 + ... + 52879710.

It is an arithmetic number, because the mean of its divisors is an integer number (350509730004).

Almost surely, 2^{21031002202100} is an apocalyptic number.

21031002202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031002202100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25236700560288).

21031002202100 is an abundant number, since it is smaller than the sum of its proper divisors (29442398918476).

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

21031002202100 is a wasteful number, since it uses less digits than its factorization.

21031002202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399906 (or 399899 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21031002202100 its reverse (120220013012), we get a palindrome (21151222215112).

The spelling of 21031002202100 in words is "twenty-one trillion, thirty-one billion, two million, two hundred two thousand, one hundred".