21101001210012 has 12 divisors (see below), whose sum is σ = 49235669490056. Its totient is φ = 7033667070000.

The previous prime is 21101001209941. The next prime is 21101001210031. The reversal of 21101001210012 is 21001210010112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1758416767501 = 21101001210012 / (2 + 1 + 1 + 0 + 1 + 0 + 0 + 1 + 2 + 1 + 0 + 0 + 1 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 21101001210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879208383739 + ... + 879208383762.

Almost surely, 2^{21101001210012} is an apocalyptic number.

It is an amenable number.

21101001210012 is an abundant number, since it is smaller than the sum of its proper divisors (28134668280044).

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

21101001210012 is a wasteful number, since it uses less digits than its factorization.

21101001210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758416767508 (or 1758416767506 counting only the distinct ones).

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

Adding to 21101001210012 its reverse (21001210010112), we get a palindrome (42102211220124).

The spelling of 21101001210012 in words is "twenty-one trillion, one hundred one billion, one million, two hundred ten thousand, twelve".