21020333321 has 16 divisors (see below), whose sum is σ = 22718177664. Its totient is φ = 19334173824.

The previous prime is 21020333317. The next prime is 21020333333. The reversal of 21020333321 is 12333302012.

It is a cyclic number.

It is not a de Polignac number, because 21020333321 - 2² = 21020333317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020333293 and 21020333302.

It is not an unprimeable number, because it can be changed into a prime (21020333381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5243900 + ... + 5247906.

It is an arithmetic number, because the mean of its divisors is an integer number (1419886104).

Almost surely, 2^21020333321 is an apocalyptic number.

It is an amenable number.

21020333321 is a deficient number, since it is larger than the sum of its proper divisors (1697844343).

21020333321 is a wasteful number, since it uses less digits than its factorization.

21020333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21020333321 its reverse (12333302012), we get a palindrome (33353635333).

The spelling of 21020333321 in words is "twenty-one billion, twenty million, three hundred thirty-three thousand, three hundred twenty-one".