21010533331 has 8 divisors (see below), whose sum is σ = 21125951264. Its totient is φ = 20895183360.

The previous prime is 21010533319. The next prime is 21010533407. The reversal of 21010533331 is 13333501012.

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 a de Polignac number, because none of the positive numbers 2^k-21010533331 is a prime.

It is a super-2 number, since 2×21010533331² (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 (21010536331) 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, 681061 + ... + 711241.

It is an arithmetic number, because the mean of its divisors is an integer number (2640743908).

Almost surely, 2^21010533331 is an apocalyptic number.

21010533331 is a deficient number, since it is larger than the sum of its proper divisors (115417933).

21010533331 is a wasteful number, since it uses less digits than its factorization.

21010533331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33981.

The product of its (nonzero) digits is 810, while the sum is 22.

The spelling of 21010533331 in words is "twenty-one billion, ten million, five hundred thirty-three thousand, three hundred thirty-one".