21765342701 has 4 divisors (see below), whose sum is σ = 21765647004. Its totient is φ = 21765038400.

The previous prime is 21765342671. The next prime is 21765342749. The reversal of 21765342701 is 10724356712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8837880100 + 12927462601 = 94010^2 + 113699^2 .

It is a cyclic number.

It is not a de Polignac number, because 21765342701 - 2³⁰ = 20691600877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765342751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20261 + ... + 209621.

It is an arithmetic number, because the mean of its divisors is an integer number (5441411751).

Almost surely, 2^21765342701 is an apocalyptic number.

It is an amenable number.

21765342701 is a deficient number, since it is larger than the sum of its proper divisors (304303).

21765342701 is a wasteful number, since it uses less digits than its factorization.

21765342701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304302.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 21765342701 in words is "twenty-one billion, seven hundred sixty-five million, three hundred forty-two thousand, seven hundred one".