21706963755 has 16 divisors (see below), whose sum is σ = 34734223104. Its totient is φ = 11576020320.

The previous prime is 21706963753. The next prime is 21706963783. The reversal of 21706963755 is 55736960712.

It is not a de Polignac number, because 21706963755 - 2¹ = 21706963753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21706963698 and 21706963707.

It is not an unprimeable number, because it can be changed into a prime (21706963753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129360 + ... + 245250.

It is an arithmetic number, because the mean of its divisors is an integer number (2170888944).

Almost surely, 2^21706963755 is an apocalyptic number.

21706963755 is a deficient number, since it is larger than the sum of its proper divisors (13027259349).

21706963755 is a wasteful number, since it uses less digits than its factorization.

21706963755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128386.

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 21706963755 in words is "twenty-one billion, seven hundred six million, nine hundred sixty-three thousand, seven hundred fifty-five".