21701113723 has 2 divisors, whose sum is σ = 21701113724. Its totient is φ = 21701113722.

The previous prime is 21701113699. The next prime is 21701113741. The reversal of 21701113723 is 32731110712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21701113723 - 2¹⁷ = 21700982651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21701113691 and 21701113700.

It is not a weakly prime, because it can be changed into another prime (21701113123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850556861 + 10850556862.

It is an arithmetic number, because the mean of its divisors is an integer number (10850556862).

Almost surely, 2^21701113723 is an apocalyptic number.

21701113723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21701113723 is an equidigital number, since it uses as much as digits as its factorization.

21701113723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

It can be divided in two parts, 21701 and 113723, that added together give a square (135424 = 368²).

The spelling of 21701113723 in words is "twenty-one billion, seven hundred one million, one hundred thirteen thousand, seven hundred twenty-three".