21725529679 has 8 divisors (see below), whose sum is σ = 25199762048. Its totient is φ = 18343943640.

The previous prime is 21725529677. The next prime is 21725529691. The reversal of 21725529679 is 97692552712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21725529679 - 2¹ = 21725529677 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 (21725529671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23161077 + ... + 23162014.

It is an arithmetic number, because the mean of its divisors is an integer number (3149970256).

Almost surely, 2^21725529679 is an apocalyptic number.

21725529679 is a deficient number, since it is larger than the sum of its proper divisors (3474232369).

21725529679 is an equidigital number, since it uses as much as digits as its factorization.

21725529679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46323165.

The product of its digits is 4762800, while the sum is 55.

The spelling of 21725529679 in words is "twenty-one billion, seven hundred twenty-five million, five hundred twenty-nine thousand, six hundred seventy-nine".