21320673377 has 8 divisors (see below), whose sum is σ = 22250321664. Its totient is φ = 20391247008.

The previous prime is 21320673373. The next prime is 21320673379. The reversal of 21320673377 is 77337602312.

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 21320673377 - 2² = 21320673373 is a prime.

It is a super-2 number, since 2×21320673377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320673373) by changing a digit.

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, 158453 + ... + 260285.

It is an arithmetic number, because the mean of its divisors is an integer number (2781290208).

Almost surely, 2^21320673377 is an apocalyptic number.

It is an amenable number.

21320673377 is a deficient number, since it is larger than the sum of its proper divisors (929648287).

21320673377 is a wasteful number, since it uses less digits than its factorization.

21320673377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110959.

The product of its (nonzero) digits is 222264, while the sum is 41.

The spelling of 21320673377 in words is "twenty-one billion, three hundred twenty million, six hundred seventy-three thousand, three hundred seventy-seven".