21120221121111 has 30 divisors (see below), whose sum is σ = 36700973822040. Its totient is φ = 12068697781224.

The previous prime is 21120221121079. The next prime is 21120221121143. The reversal of 21120221121111 is 11112112202112.

It is a happy number.

21120221121111 is a `hidden beast` number, since 211 + 2 + 0 + 221 + 121 + 111 = 666.

It is an interprime number because it is at equal distance from previous prime (21120221121079) and next prime (21120221121143).

It is not a de Polignac number, because 21120221121111 - 2⁵ = 21120221121079 is a prime.

It is a super-3 number, since 3×21120221121111³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120221121511) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2660643691 + ... + 2660651628.

It is an arithmetic number, because the mean of its divisors is an integer number (1223365794068).

Almost surely, 2^{21120221121111} is an apocalyptic number.

21120221121111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21120221121111 is a deficient number, since it is larger than the sum of its proper divisors (15580752700929).

21120221121111 is an equidigital number, since it uses as much as digits as its factorization.

21120221121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321295345 (or 5321295329 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21120221121111 its reverse (11112112202112), we get a palindrome (32232333323223).

The spelling of 21120221121111 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".