21122523647 has 8 divisors (see below), whose sum is σ = 22671396576. Its totient is φ = 19607692032.

The previous prime is 21122523581. The next prime is 21122523673. The reversal of 21122523647 is 74632522112.

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 21122523647 - 2³² = 16827556351 is a prime.

It is a super-2 number, since 2×21122523647² (a number of 21 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 (21122523677) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8509043 + ... + 8511524.

It is an arithmetic number, because the mean of its divisors is an integer number (2833924572).

Almost surely, 2^21122523647 is an apocalyptic number.

21122523647 is a deficient number, since it is larger than the sum of its proper divisors (1548872929).

21122523647 is a wasteful number, since it uses less digits than its factorization.

21122523647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17020657.

The product of its digits is 40320, while the sum is 35.

The spelling of 21122523647 in words is "twenty-one billion, one hundred twenty-two million, five hundred twenty-three thousand, six hundred forty-seven".