21211010102111 has 4 divisors (see below), whose sum is σ = 21421020103224. Its totient is φ = 21001000101000.

The previous prime is 21211010102089. The next prime is 21211010102201. The reversal of 21211010102111 is 11120101011212.

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 21211010102111 - 2⁴² = 16812963591007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211010102411) 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, 105005000405 + ... + 105005000606.

It is an arithmetic number, because the mean of its divisors is an integer number (5355255025806).

Almost surely, 2^{21211010102111} is an apocalyptic number.

21211010102111 is a deficient number, since it is larger than the sum of its proper divisors (210010001113).

21211010102111 is a wasteful number, since it uses less digits than its factorization.

21211010102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210010001112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21211010102111 its reverse (11120101011212), we get a palindrome (32331111113323).

The spelling of 21211010102111 in words is "twenty-one trillion, two hundred eleven billion, ten million, one hundred two thousand, one hundred eleven".