21212130120111 has 40 divisors (see below), whose sum is σ = 36221004462720. Its totient is φ = 12118875078672.

The previous prime is 21212130120061. The next prime is 21212130120113. The reversal of 21212130120111 is 11102103121212.

It is a happy number.

21212130120111 is a `hidden beast` number, since 21 + 212 + 1 + 301 + 20 + 111 = 666.

It is not a de Polignac number, because 21212130120111 - 2¹³ = 21212130111919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212130120113) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 675321 + ... + 6548306.

It is an arithmetic number, because the mean of its divisors is an integer number (905525111568).

Almost surely, 2^{21212130120111} is an apocalyptic number.

21212130120111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21212130120111 is a deficient number, since it is larger than the sum of its proper divisors (15008874342609).

21212130120111 is an equidigital number, since it uses as much as digits as its factorization.

21212130120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7228825 (or 7228816 counting only the distinct ones).

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

Adding to 21212130120111 its reverse (11102103121212), we get a palindrome (32314233241323).

The spelling of 21212130120111 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty million, one hundred twenty thousand, one hundred eleven".