21496741819 has 4 divisors (see below), whose sum is σ = 24567704944. Its totient is φ = 18425778696.

The previous prime is 21496741817. The next prime is 21496741829. The reversal of 21496741819 is 91814769412.

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 21496741819 - 2¹ = 21496741817 is a prime.

It is a super-2 number, since 2×21496741819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21496741817) 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, 1535481552 + ... + 1535481565.

It is an arithmetic number, because the mean of its divisors is an integer number (6141926236).

Almost surely, 2^21496741819 is an apocalyptic number.

21496741819 is a deficient number, since it is larger than the sum of its proper divisors (3070963125).

21496741819 is an equidigital number, since it uses as much as digits as its factorization.

21496741819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070963124.

The product of its digits is 870912, while the sum is 52.

The spelling of 21496741819 in words is "twenty-one billion, four hundred ninety-six million, seven hundred forty-one thousand, eight hundred nineteen".