21111434310413 has 4 divisors (see below), whose sum is σ = 21111533541180. Its totient is φ = 21111335079648.

The previous prime is 21111434310391. The next prime is 21111434310433. The reversal of 21111434310413 is 31401343411112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4332071937769 + 16779362372644 = 2081363^2 + 4096262^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111434310413 - 2⁶ = 21111434310349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111434310433) 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 3 ways as a sum of consecutive naturals, for example, 49295570 + ... + 49721987.

It is an arithmetic number, because the mean of its divisors is an integer number (5277883385295).

Almost surely, 2^{21111434310413} is an apocalyptic number.

It is an amenable number.

21111434310413 is a deficient number, since it is larger than the sum of its proper divisors (99230767).

21111434310413 is an equidigital number, since it uses as much as digits as its factorization.

21111434310413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99230766.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 21111434310413 its reverse (31401343411112), we get a palindrome (52512777721525).

The spelling of 21111434310413 in words is "twenty-one trillion, one hundred eleven billion, four hundred thirty-four million, three hundred ten thousand, four hundred thirteen".