21001212102000 has 160 divisors (see below), whose sum is σ = 72916208688960. Its totient is φ = 5169529113600.

The previous prime is 21001212101983. The next prime is 21001212102067. The reversal of 21001212102000 is 20121210012.

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 31 ways as a sum of consecutive naturals, for example, 134545155 + ... + 134701154.

It is an arithmetic number, because the mean of its divisors is an integer number (455726304306).

Almost surely, 2^{21001212102000} is an apocalyptic number.

21001212102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001212102000 is an abundant number, since it is smaller than the sum of its proper divisors (51914996586960).

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

21001212102000 is a wasteful number, since it uses less digits than its factorization.

21001212102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269246348 (or 269246332 counting only the distinct ones).

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

Adding to 21001212102000 its reverse (20121210012), we get a palindrome (21021333312012).

The spelling of 21001212102000 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred two thousand".