21012103333131 has 4 divisors (see below), whose sum is σ = 28016137777512. Its totient is φ = 14008068888752.

The previous prime is 21012103333097. The next prime is 21012103333147. The reversal of 21012103333131 is 13133330121012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012103333131 - 2¹⁰ = 21012103332107 is a prime.

It is a super-2 number, since 2×21012103333131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012103333931) 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 3 ways as a sum of consecutive naturals, for example, 3502017222186 + ... + 3502017222191.

It is an arithmetic number, because the mean of its divisors is an integer number (7004034444378).

Almost surely, 2^{21012103333131} is an apocalyptic number.

21012103333131 is a deficient number, since it is larger than the sum of its proper divisors (7004034444381).

21012103333131 is an equidigital number, since it uses as much as digits as its factorization.

21012103333131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004034444380.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21012103333131 its reverse (13133330121012), we get a palindrome (34145433454143).

The spelling of 21012103333131 in words is "twenty-one trillion, twelve billion, one hundred three million, three hundred thirty-three thousand, one hundred thirty-one".