21120033111 has 8 divisors (see below), whose sum is σ = 28621684464. Its totient is φ = 13849201920.

The previous prime is 21120033101. The next prime is 21120033157. The reversal of 21120033111 is 11133002112.

It is a happy number.

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

It is not a de Polignac number, because 21120033111 - 2⁶ = 21120033047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120033101) 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, 57704826 + ... + 57705191.

It is an arithmetic number, because the mean of its divisors is an integer number (3577710558).

Almost surely, 2^21120033111 is an apocalyptic number.

21120033111 is a deficient number, since it is larger than the sum of its proper divisors (7501651353).

21120033111 is a wasteful number, since it uses less digits than its factorization.

21120033111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115410081.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21120033111 its reverse (11133002112), we get a palindrome (32253035223).

The spelling of 21120033111 in words is "twenty-one billion, one hundred twenty million, thirty-three thousand, one hundred eleven".