21177316421185 has 8 divisors (see below), whose sum is σ = 26750294426880. Its totient is φ = 16050176655984.

The previous prime is 21177316421143. The next prime is 21177316421231. The reversal of 21177316421185 is 58112461377112.

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 21177316421185 - 2¹⁹ = 21177315896897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111459560017 + ... + 111459560206.

It is an arithmetic number, because the mean of its divisors is an integer number (3343786803360).

Almost surely, 2^{21177316421185} is an apocalyptic number.

It is an amenable number.

21177316421185 is a deficient number, since it is larger than the sum of its proper divisors (5572978005695).

21177316421185 is a wasteful number, since it uses less digits than its factorization.

21177316421185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222919120247.

The product of its digits is 564480, while the sum is 49.

Adding to 21177316421185 its reverse (58112461377112), we get a palindrome (79289777798297).

The spelling of 21177316421185 in words is "twenty-one trillion, one hundred seventy-seven billion, three hundred sixteen million, four hundred twenty-one thousand, one hundred eighty-five".