21323302020021 has 16 divisors (see below), whose sum is σ = 29718619161984. Its totient is φ = 13573902127104.

The previous prime is 21323302020019. The next prime is 21323302020071. The reversal of 21323302020021 is 12002020332312.

It is a happy number.

It is not a de Polignac number, because 21323302020021 - 2¹ = 21323302020019 is a prime.

It is a super-3 number, since 3×21323302020021³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323302020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323302020071) 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, 267753396 + ... + 267833021.

It is an arithmetic number, because the mean of its divisors is an integer number (1857413697624).

Almost surely, 2^{21323302020021} is an apocalyptic number.

It is an amenable number.

21323302020021 is a deficient number, since it is larger than the sum of its proper divisors (8395317141963).

21323302020021 is a wasteful number, since it uses less digits than its factorization.

21323302020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535587020.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21323302020021 its reverse (12002020332312), we get a palindrome (33325322352333).

The spelling of 21323302020021 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred two million, twenty thousand, twenty-one".