21496747695 has 16 divisors (see below), whose sum is σ = 35194676352. Its totient is φ = 11198305440.

The previous prime is 21496747633. The next prime is 21496747711. The reversal of 21496747695 is 59674769412.

It is not a de Polignac number, because 21496747695 - 2⁷ = 21496747567 is a prime.

It is a super-2 number, since 2×21496747695² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16663501 + ... + 16664790.

It is an arithmetic number, because the mean of its divisors is an integer number (2199667272).

Almost surely, 2^21496747695 is an apocalyptic number.

21496747695 is a deficient number, since it is larger than the sum of its proper divisors (13697928657).

21496747695 is a wasteful number, since it uses less digits than its factorization.

21496747695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33328342.

The product of its digits is 22861440, while the sum is 60.

The spelling of 21496747695 in words is "twenty-one billion, four hundred ninety-six million, seven hundred forty-seven thousand, six hundred ninety-five".