21221002100111 has 8 divisors (see below), whose sum is σ = 24511959645264. Its totient is φ = 18157007144320.

The previous prime is 21221002100093. The next prime is 21221002100153. The reversal of 21221002100111 is 11100120012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221002100111 - 2¹⁴ = 21221002083727 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 (21221002103111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56740647140 + ... + 56740647513.

It is an arithmetic number, because the mean of its divisors is an integer number (3063994955658).

Almost surely, 2^{21221002100111} is an apocalyptic number.

21221002100111 is a deficient number, since it is larger than the sum of its proper divisors (3290957545153).

21221002100111 is a wasteful number, since it uses less digits than its factorization.

21221002100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113481294681.

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

Adding to 21221002100111 its reverse (11100120012212), we get a palindrome (32321122112323).

The spelling of 21221002100111 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one hundred thousand, one hundred eleven".