21177824797 has 8 divisors (see below), whose sum is σ = 21831799680. Its totient is φ = 20533684320.

The previous prime is 21177824771. The next prime is 21177824807. The reversal of 21177824797 is 79742877112.

It is a happy number.

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 21177824797 - 2¹¹ = 21177822749 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 (21177824597) 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, 2454229 + ... + 2462842.

It is an arithmetic number, because the mean of its divisors is an integer number (2728974960).

Almost surely, 2^21177824797 is an apocalyptic number.

It is an amenable number.

21177824797 is a deficient number, since it is larger than the sum of its proper divisors (653974883).

21177824797 is an equidigital number, since it uses as much as digits as its factorization.

21177824797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4917203.

The product of its digits is 2765952, while the sum is 55.

The spelling of 21177824797 in words is "twenty-one billion, one hundred seventy-seven million, eight hundred twenty-four thousand, seven hundred ninety-seven".