21936039895 has 32 divisors (see below), whose sum is σ = 34245504000. Its totient is φ = 13079869440.

The previous prime is 21936039893. The next prime is 21936039967. The reversal of 21936039895 is 59893063912.

It is a happy number.

It is not a de Polignac number, because 21936039895 - 2¹ = 21936039893 is a prime.

It is a super-2 number, since 2×21936039895² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936039893) 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 31 ways as a sum of consecutive naturals, for example, 1229770 + ... + 1247479.

It is an arithmetic number, because the mean of its divisors is an integer number (1070172000).

Almost surely, 2^21936039895 is an apocalyptic number.

21936039895 is a deficient number, since it is larger than the sum of its proper divisors (12309464105).

21936039895 is a wasteful number, since it uses less digits than its factorization.

21936039895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477295.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 21936039895 in words is "twenty-one billion, nine hundred thirty-six million, thirty-nine thousand, eight hundred ninety-five".