21212113021110 has 48 divisors (see below), whose sum is σ = 60165266026320. Its totient is φ = 5142330429120.

The previous prime is 21212113021091. The next prime is 21212113021139. The reversal of 21212113021110 is 1112031121212.

It is a happy number.

21212113021110 is a `hidden beast` number, since 21 + 21 + 211 + 302 + 1 + 110 = 666.

It is a super-2 number, since 2×21212113021110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10713187405 + ... + 10713189384.

It is an arithmetic number, because the mean of its divisors is an integer number (1253443042215).

Almost surely, 2^{21212113021110} is an apocalyptic number.

21212113021110 is an abundant number, since it is smaller than the sum of its proper divisors (38953153005210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212113021110 is a wasteful number, since it uses less digits than its factorization.

21212113021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21426376813 (or 21426376810 counting only the distinct ones).

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

Adding to 21212113021110 its reverse (1112031121212), we get a palindrome (22324144142322).

It can be divided in two parts, 212121 and 13021110, that added together give a palindrome (13233231).

The spelling of 21212113021110 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirteen million, twenty-one thousand, one hundred ten".