21213221100111 has 12 divisors (see below), whose sum is σ = 31469463133992. Its totient is φ = 13759927199856.

The previous prime is 21213221100103. The next prime is 21213221100161. The reversal of 21213221100111 is 11100112231212.

It is a happy number.

21213221100111 is a `hidden beast` number, since 2 + 121 + 322 + 110 + 0 + 111 = 666.

It is not a de Polignac number, because 21213221100111 - 2³ = 21213221100103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213221100161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31851683001 + ... + 31851683666.

It is an arithmetic number, because the mean of its divisors is an integer number (2622455261166).

Almost surely, 2^{21213221100111} is an apocalyptic number.

21213221100111 is a deficient number, since it is larger than the sum of its proper divisors (10256242033881).

21213221100111 is a wasteful number, since it uses less digits than its factorization.

21213221100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63703366710 (or 63703366707 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21213221100111 its reverse (11100112231212), we get a palindrome (32313333331323).

The spelling of 21213221100111 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty-one million, one hundred thousand, one hundred eleven".