21012213440191 has 8 divisors (see below), whose sum is σ = 21361312514864. Its totient is φ = 20664158011200.

The previous prime is 21012213440173. The next prime is 21012213440249. The reversal of 21012213440191 is 19104431221012.

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 21012213440191 - 2¹¹ = 21012213438143 is a prime.

It is a super-2 number, since 2×21012213440191² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012213440111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260870820 + ... + 260951353.

It is an arithmetic number, because the mean of its divisors is an integer number (2670164064358).

Almost surely, 2^{21012213440191} is an apocalyptic number.

21012213440191 is a deficient number, since it is larger than the sum of its proper divisors (349099074673).

21012213440191 is an equidigital number, since it uses as much as digits as its factorization.

21012213440191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521822841.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21012213440191 in words is "twenty-one trillion, twelve billion, two hundred thirteen million, four hundred forty thousand, one hundred ninety-one".