21120646135331 has 4 divisors (see below), whose sum is σ = 21120700986000. Its totient is φ = 21120591284664.

The previous prime is 21120646135249. The next prime is 21120646135339. The reversal of 21120646135331 is 13353164602112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120646135331 is a prime.

It is a super-2 number, since 2×21120646135331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120646135339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26843636 + ... + 27619233.

It is an arithmetic number, because the mean of its divisors is an integer number (5280175246500).

Almost surely, 2^{21120646135331} is an apocalyptic number.

21120646135331 is a deficient number, since it is larger than the sum of its proper divisors (54850669).

21120646135331 is an equidigital number, since it uses as much as digits as its factorization.

21120646135331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54850668.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21120646135331 in words is "twenty-one trillion, one hundred twenty billion, six hundred forty-six million, one hundred thirty-five thousand, three hundred thirty-one".