21210003012100 has 72 divisors (see below), whose sum is σ = 53066301539328. Its totient is φ = 7207647014400.

The previous prime is 21210003012047. The next prime is 21210003012127. The reversal of 21210003012100 is 121030001212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133991716 + ... + 134149915.

It is an arithmetic number, because the mean of its divisors is an integer number (737031965824).

Almost surely, 2^{21210003012100} is an apocalyptic number.

21210003012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210003012100 is an abundant number, since it is smaller than the sum of its proper divisors (31856298527228).

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

21210003012100 is a wasteful number, since it uses less digits than its factorization.

21210003012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268141765 (or 268141758 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210003012100 its reverse (121030001212), we get a palindrome (21331033013312).

The spelling of 21210003012100 in words is "twenty-one trillion, two hundred ten billion, three million, twelve thousand, one hundred".