21764708061 has 16 divisors (see below), whose sum is σ = 29815425024. Its totient is φ = 14112201024.

The previous prime is 21764708047. The next prime is 21764708081. The reversal of 21764708061 is 16080746712.

It is not a de Polignac number, because 21764708061 - 2⁵ = 21764708029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21764708011) 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 15 ways as a sum of consecutive naturals, for example, 261771 + ... + 334743.

It is an arithmetic number, because the mean of its divisors is an integer number (1863464064).

Almost surely, 2^21764708061 is an apocalyptic number.

It is an amenable number.

21764708061 is a deficient number, since it is larger than the sum of its proper divisors (8050716963).

21764708061 is a wasteful number, since it uses less digits than its factorization.

21764708061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75700.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 21764708061 in words is "twenty-one billion, seven hundred sixty-four million, seven hundred eight thousand, sixty-one".