21021021311 has 8 divisors (see below), whose sum is σ = 21295249920. Its totient is φ = 20747291992.

The previous prime is 21021021299. The next prime is 21021021313. The reversal of 21021021311 is 11312012012.

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 21021021311 - 2³⁰ = 19947279487 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 (21021021313) 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, 39695 + ... + 208848.

It is an arithmetic number, because the mean of its divisors is an integer number (2661906240).

Almost surely, 2^21021021311 is an apocalyptic number.

21021021311 is a deficient number, since it is larger than the sum of its proper divisors (274228609).

21021021311 is a wasteful number, since it uses less digits than its factorization.

21021021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249645.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21021021311 its reverse (11312012012), we get a palindrome (32333033323).

The spelling of 21021021311 in words is "twenty-one billion, twenty-one million, twenty-one thousand, three hundred eleven".