21002021300100 has 72 divisors (see below), whose sum is σ = 62408168552128. Its totient is φ = 5449173091200.

The previous prime is 21002021300083. The next prime is 21002021300107. The reversal of 21002021300100 is 100312020012.

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

It is not an unprimeable number, because it can be changed into a prime (21002021300107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 946025896 + ... + 946048095.

Almost surely, 2^{21002021300100} is an apocalyptic number.

21002021300100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002021300100 is an abundant number, since it is smaller than the sum of its proper divisors (41406147252028).

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

21002021300100 is a wasteful number, since it uses less digits than its factorization.

21002021300100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892074045 (or 1892074038 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002021300100 its reverse (100312020012), we get a palindrome (21102333320112).

The spelling of 21002021300100 in words is "twenty-one trillion, two billion, twenty-one million, three hundred thousand, one hundred".