3135216821 has 8 divisors (see below), whose sum is σ = 3421495488. Its totient is φ = 2849148000.

The previous prime is 3135216797. The next prime is 3135216839. The reversal of 3135216821 is 1286125313.

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 3135216821 - 2⁶ = 3135216757 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 (3135216841) 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, 20360 + ... + 81761.

It is an arithmetic number, because the mean of its divisors is an integer number (427686936).

Almost surely, 2^3135216821 is an apocalyptic number.

It is an amenable number.

3135216821 is a deficient number, since it is larger than the sum of its proper divisors (286278667).

3135216821 is a wasteful number, since it uses less digits than its factorization.

3135216821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104923.

The product of its digits is 8640, while the sum is 32.

The square root of 3135216821 is about 55993.0068937184. The cubic root of 3135216821 is about 1463.6004247407.

The spelling of 3135216821 in words is "three billion, one hundred thirty-five million, two hundred sixteen thousand, eight hundred twenty-one".