21033111121 has 8 divisors (see below), whose sum is σ = 23077845504. Its totient is φ = 19010482320.

The previous prime is 21033111107. The next prime is 21033111137. The reversal of 21033111121 is 12111133012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21033111121 - 2⁷ = 21033110993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033111095 and 21033111104.

It is not an unprimeable number, because it can be changed into a prime (21033111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5524401 + ... + 5528206.

It is an arithmetic number, because the mean of its divisors is an integer number (2884730688).

Almost surely, 2^21033111121 is an apocalyptic number.

It is an amenable number.

21033111121 is a deficient number, since it is larger than the sum of its proper divisors (2044734383).

21033111121 is a wasteful number, since it uses less digits than its factorization.

21033111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11052791.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21033111121 its reverse (12111133012), we get a palindrome (33144244133).

The spelling of 21033111121 in words is "twenty-one billion, thirty-three million, one hundred eleven thousand, one hundred twenty-one".