21021102100211 has 4 divisors (see below), whose sum is σ = 21365710331424. Its totient is φ = 20676493869000.

The previous prime is 21021102100199. The next prime is 21021102100249. The reversal of 21021102100211 is 11200120112012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21021102100211 - 2³⁸ = 20746224193267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021102100261) 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, 172304115515 + ... + 172304115636.

It is an arithmetic number, because the mean of its divisors is an integer number (5341427582856).

Almost surely, 2^{21021102100211} is an apocalyptic number.

21021102100211 is a deficient number, since it is larger than the sum of its proper divisors (344608231213).

21021102100211 is an equidigital number, since it uses as much as digits as its factorization.

21021102100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344608231212.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021102100211 its reverse (11200120112012), we get a palindrome (32221222212223).

The spelling of 21021102100211 in words is "twenty-one trillion, twenty-one billion, one hundred two million, one hundred thousand, two hundred eleven".