21121033311 has 32 divisors (see below), whose sum is σ = 35767787520. Its totient is φ = 12066695712.

The previous prime is 21121033253. The next prime is 21121033319. The reversal of 21121033311 is 11333012112.

It is not a de Polignac number, because 21121033311 - 2¹⁸ = 21120771167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121033319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1334601 + ... + 1350333.

It is an arithmetic number, because the mean of its divisors is an integer number (1117743360).

Almost surely, 2^21121033311 is an apocalyptic number.

21121033311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121033311 is a deficient number, since it is larger than the sum of its proper divisors (14646754209).

21121033311 is a wasteful number, since it uses less digits than its factorization.

21121033311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22852 (or 22846 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21121033311 its reverse (11333012112), we get a palindrome (32454045423).

The spelling of 21121033311 in words is "twenty-one billion, one hundred twenty-one million, thirty-three thousand, three hundred eleven".