21935706012 has 96 divisors (see below), whose sum is σ = 62335123200. Its totient is φ = 6615604800.

The previous prime is 21935705983. The next prime is 21935706029. The reversal of 21935706012 is 21060753912.

21935706012 is a `hidden beast` number, since 2 + 19 + 3 + 570 + 60 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 206914 + ... + 294422.

It is an arithmetic number, because the mean of its divisors is an integer number (649324200).

Almost surely, 2^21935706012 is an apocalyptic number.

21935706012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21935706012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31167561600).

21935706012 is an abundant number, since it is smaller than the sum of its proper divisors (40399417188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21935706012 is a wasteful number, since it uses less digits than its factorization.

21935706012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87744 (or 87736 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 21935706012 in words is "twenty-one billion, nine hundred thirty-five million, seven hundred six thousand, twelve".