21000001100202 has 24 divisors (see below), whose sum is σ = 47185187658336. Its totient is φ = 7000000366572.

The previous prime is 21000001100189. The next prime is 21000001100203. The reversal of 21000001100202 is 20200110000012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21000001100203) 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, 21604938918 + ... + 21604939889.

It is an arithmetic number, because the mean of its divisors is an integer number (1966049485764).

Almost surely, 2^{21000001100202} is an apocalyptic number.

21000001100202 is an abundant number, since it is smaller than the sum of its proper divisors (26185186558134).

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

21000001100202 is an equidigital number, since it uses as much as digits as its factorization.

21000001100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43209878824 (or 43209878812 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21000001100202 its reverse (20200110000012), we get a palindrome (41200111100214).

The spelling of 21000001100202 in words is "twenty-one trillion, one million, one hundred thousand, two hundred two".