21010021333 has 8 divisors (see below), whose sum is σ = 24013469952. Its totient is φ = 18007076976.

The previous prime is 21010021327. The next prime is 21010021339. The reversal of 21010021333 is 33312001012.

It is an interprime number because it is at equal distance from previous prime (21010021327) and next prime (21010021339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21010021333 - 2⁹ = 21010020821 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 (21010021339) 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, 32110 + ... + 207487.

It is an arithmetic number, because the mean of its divisors is an integer number (3001683744).

Almost surely, 2^21010021333 is an apocalyptic number.

It is an amenable number.

21010021333 is a deficient number, since it is larger than the sum of its proper divisors (3003448619).

21010021333 is a wasteful number, since it uses less digits than its factorization.

21010021333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252131.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21010021333 its reverse (33312001012), we get a palindrome (54322022345).

The spelling of 21010021333 in words is "twenty-one billion, ten million, twenty-one thousand, three hundred thirty-three".