21035513021 has 8 divisors (see below), whose sum is σ = 21410669760. Its totient is φ = 20660977152.

The previous prime is 21035512999. The next prime is 21035513071. The reversal of 21035513021 is 12031553012.

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 21035513021 - 2¹⁰ = 21035511997 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 (21035513071) 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, 86585 + ... + 222638.

It is an arithmetic number, because the mean of its divisors is an integer number (2676333720).

Almost surely, 2^21035513021 is an apocalyptic number.

It is an amenable number.

21035513021 is a deficient number, since it is larger than the sum of its proper divisors (375156739).

21035513021 is a wasteful number, since it uses less digits than its factorization.

21035513021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310435.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 21035513021 in words is "twenty-one billion, thirty-five million, five hundred thirteen thousand, twenty-one".