21230176746 has 32 divisors (see below), whose sum is σ = 43014565440. Its totient is φ = 6984526464.

The previous prime is 21230176739. The next prime is 21230176771. The reversal of 21230176746 is 64767103212.

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 15 ways as a sum of consecutive naturals, for example, 493800 + ... + 535068.

It is an arithmetic number, because the mean of its divisors is an integer number (1344205170).

Almost surely, 2^21230176746 is an apocalyptic number.

21230176746 is an abundant number, since it is smaller than the sum of its proper divisors (21784388694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230176746 is a wasteful number, since it uses less digits than its factorization.

21230176746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42390.

The product of its (nonzero) digits is 84672, while the sum is 39.

Adding to 21230176746 its reverse (64767103212), we get a palindrome (85997279958).

The spelling of 21230176746 in words is "twenty-one billion, two hundred thirty million, one hundred seventy-six thousand, seven hundred forty-six".