21035378693 has 8 divisors (see below), whose sum is σ = 24815930880. Its totient is φ = 17448701040.

The previous prime is 21035378687. The next prime is 21035378701. The reversal of 21035378693 is 39687353012.

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 21035378693 - 2²⁸ = 20766943237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035378293) 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, 48468398 + ... + 48468831.

It is an arithmetic number, because the mean of its divisors is an integer number (3101991360).

Almost surely, 2^21035378693 is an apocalyptic number.

It is an amenable number.

21035378693 is a deficient number, since it is larger than the sum of its proper divisors (3780552187).

21035378693 is an equidigital number, since it uses as much as digits as its factorization.

21035378693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96937267.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 21035378693 in words is "twenty-one billion, thirty-five million, three hundred seventy-eight thousand, six hundred ninety-three".