21100021201001 has 4 divisors (see below), whose sum is σ = 21304875775872. Its totient is φ = 20895166626132.

The previous prime is 21100021200977. The next prime is 21100021201033. The reversal of 21100021201001 is 10010212000112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100021201001 - 2¹⁰ = 21100021199977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100021201601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102427287281 + ... + 102427287486.

It is an arithmetic number, because the mean of its divisors is an integer number (5326218943968).

Almost surely, 2^{21100021201001} is an apocalyptic number.

It is an amenable number.

21100021201001 is a deficient number, since it is larger than the sum of its proper divisors (204854574871).

21100021201001 is a wasteful number, since it uses less digits than its factorization.

21100021201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204854574870.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100021201001 its reverse (10010212000112), we get a palindrome (31110233201113).

The spelling of 21100021201001 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred one thousand, one".