21230176745 has 8 divisors (see below), whose sum is σ = 25489416960. Its totient is φ = 16975338160.

The previous prime is 21230176739. The next prime is 21230176771. The reversal of 21230176745 is 54767103212.

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

It is not a de Polignac number, because 21230176745 - 2⁸ = 21230176489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230176699 and 21230176708.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1089785 + ... + 1109094.

It is an arithmetic number, because the mean of its divisors is an integer number (3186177120).

Almost surely, 2^21230176745 is an apocalyptic number.

It is an amenable number.

21230176745 is a deficient number, since it is larger than the sum of its proper divisors (4259240215).

21230176745 is a wasteful number, since it uses less digits than its factorization.

21230176745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200815.

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

Adding to 21230176745 its reverse (54767103212), we get a palindrome (75997279957).

The spelling of 21230176745 in words is "twenty-one billion, two hundred thirty million, one hundred seventy-six thousand, seven hundred forty-five".