21021035313 has 8 divisors (see below), whose sum is σ = 29676755808. Its totient is φ = 13189669184.

The previous prime is 21021035297. The next prime is 21021035353. The reversal of 21021035313 is 31353012012.

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 21021035313 - 2⁴ = 21021035297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21021035313.

It is not an unprimeable number, because it can be changed into a prime (21021035353) 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, 206088531 + ... + 206088632.

It is an arithmetic number, because the mean of its divisors is an integer number (3709594476).

Almost surely, 2^21021035313 is an apocalyptic number.

It is an amenable number.

21021035313 is a deficient number, since it is larger than the sum of its proper divisors (8655720495).

21021035313 is a wasteful number, since it uses less digits than its factorization.

21021035313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412177183.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21021035313 its reverse (31353012012), we get a palindrome (52374047325).

The spelling of 21021035313 in words is "twenty-one billion, twenty-one million, thirty-five thousand, three hundred thirteen".