21906346524769 has 16 divisors (see below), whose sum is σ = 26124817416192. Its totient is φ = 17960153756688.

The previous prime is 21906346524743. The next prime is 21906346524787. The reversal of 21906346524769 is 96742564360912.

It is a cyclic number.

It is not a de Polignac number, because 21906346524769 - 2¹⁹ = 21906346000481 is a prime.

It is a super-2 number, since 2×21906346524769² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21906346524769.

It is not an unprimeable number, because it can be changed into a prime (21906346524739) 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, 7768792 + ... + 10206214.

It is an arithmetic number, because the mean of its divisors is an integer number (1632801088512).

Almost surely, 2^{21906346524769} is an apocalyptic number.

It is an amenable number.

21906346524769 is a deficient number, since it is larger than the sum of its proper divisors (4218470891423).

21906346524769 is a wasteful number, since it uses less digits than its factorization.

21906346524769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493276.

The product of its (nonzero) digits is 117573120, while the sum is 64.

The spelling of 21906346524769 in words is "twenty-one trillion, nine hundred six billion, three hundred forty-six million, five hundred twenty-four thousand, seven hundred sixty-nine".