21234177766 has 4 divisors (see below), whose sum is σ = 31851266652. Its totient is φ = 10617088882.

The previous prime is 21234177749. The next prime is 21234177779. The reversal of 21234177766 is 66777143212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308544440 + ... + 5308544443.

It is an arithmetic number, because the mean of its divisors is an integer number (7962816663).

Almost surely, 2^21234177766 is an apocalyptic number.

21234177766 is a deficient number, since it is larger than the sum of its proper divisors (10617088886).

21234177766 is a wasteful number, since it uses less digits than its factorization.

21234177766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617088885.

The product of its digits is 592704, while the sum is 46.

The spelling of 21234177766 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, seven hundred sixty-six".