21201100101012 has 48 divisors (see below), whose sum is σ = 53290271132672. Its totient is φ = 6521491509120.

The previous prime is 21201100100993. The next prime is 21201100101127. The reversal of 21201100101012 is 21010100110212.

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 15 ways as a sum of consecutive naturals, for example, 19510003 + ... + 20567994.

Almost surely, 2^{21201100101012} is an apocalyptic number.

It is an amenable number.

21201100101012 is an abundant number, since it is smaller than the sum of its proper divisors (32089171031660).

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

21201100101012 is a wasteful number, since it uses less digits than its factorization.

21201100101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40081408 (or 40081406 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21201100101012 its reverse (21010100110212), we get a palindrome (42211200211224).

The spelling of 21201100101012 in words is "twenty-one trillion, two hundred one billion, one hundred million, one hundred one thousand, twelve".