21021201002100 has 144 divisors (see below), whose sum is σ = 65601150507648. Its totient is φ = 5166451253760.

The previous prime is 21021201002027. The next prime is 21021201002111. The reversal of 21021201002100 is 120010212012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1642119 + ... + 6688718.

It is an arithmetic number, because the mean of its divisors is an integer number (455563545192).

Almost surely, 2^{21021201002100} is an apocalyptic number.

21021201002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021201002100 is an abundant number, since it is smaller than the sum of its proper divisors (44579949505548).

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

21021201002100 is a wasteful number, since it uses less digits than its factorization.

21021201002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331514 (or 8331507 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021201002100 its reverse (120010212012), we get a palindrome (21141211214112).

The spelling of 21021201002100 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two thousand, one hundred".