21011121333231 has 8 divisors (see below), whose sum is σ = 28014942655920. Its totient is φ = 14007357116352.

The previous prime is 21011121333173. The next prime is 21011121333233. The reversal of 21011121333231 is 13233312111012.

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

It is not a de Polignac number, because 21011121333231 - 2¹⁰ = 21011121332207 is a prime.

It is a super-2 number, since 2×21011121333231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011121333233) 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, 13410436 + ... + 14895033.

It is an arithmetic number, because the mean of its divisors is an integer number (3501867831990).

Almost surely, 2^{21011121333231} is an apocalyptic number.

21011121333231 is a deficient number, since it is larger than the sum of its proper divisors (7003821322689).

21011121333231 is a wasteful number, since it uses less digits than its factorization.

21011121333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28552905.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21011121333231 its reverse (13233312111012), we get a palindrome (34244433444243).

It can be divided in two parts, 2101112 and 1333231, that added together give a palindrome (3434343).

The spelling of 21011121333231 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, three hundred thirty-three thousand, two hundred thirty-one".