82390000021 has 4 divisors (see below), whose sum is σ = 94160000032. Its totient is φ = 70620000012.

The previous prime is 82390000003. The next prime is 82390000037. The reversal of 82390000021 is 12000009328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82390000021 - 2⁹ = 82389999509 is a prime.

It is a super-2 number, since 2×82390000021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82390000051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5884999995 + ... + 5885000008.

It is an arithmetic number, because the mean of its divisors is an integer number (23540000008).

Almost surely, 2^82390000021 is an apocalyptic number.

It is an amenable number.

82390000021 is a deficient number, since it is larger than the sum of its proper divisors (11770000011).

82390000021 is a wasteful number, since it uses less digits than its factorization.

82390000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11770000010.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 82390000021 its reverse (12000009328), we get a palindrome (94390009349).

The spelling of 82390000021 in words is "eighty-two billion, three hundred ninety million, twenty-one", and thus it is an aban number.