21101020100211 has 16 divisors (see below), whose sum is σ = 29789818131744. Its totient is φ = 13239792328704.

The previous prime is 21101020100201. The next prime is 21101020100249. The reversal of 21101020100211 is 11200102010112.

It is not a de Polignac number, because 21101020100211 - 2¹⁴ = 21101020083827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101020100201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11221611 + ... + 12966363.

It is an arithmetic number, because the mean of its divisors is an integer number (1861863633234).

Almost surely, 2^{21101020100211} is an apocalyptic number.

21101020100211 is a deficient number, since it is larger than the sum of its proper divisors (8688798031533).

21101020100211 is a wasteful number, since it uses less digits than its factorization.

21101020100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981910.

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

Adding to 21101020100211 its reverse (11200102010112), we get a palindrome (32301122110323).

The spelling of 21101020100211 in words is "twenty-one trillion, one hundred one billion, twenty million, one hundred thousand, two hundred eleven".