21021303301331 has 4 divisors (see below), whose sum is σ = 21022414558992. Its totient is φ = 21020192043672.

The previous prime is 21021303301309. The next prime is 21021303301373. The reversal of 21021303301331 is 13310330312012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021303301331 is a prime.

It is a super-2 number, since 2×21021303301331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021303301297 and 21021303301306.

It is not an unprimeable number, because it can be changed into a prime (21021303301931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555600455 + ... + 555638288.

It is an arithmetic number, because the mean of its divisors is an integer number (5255603639748).

Almost surely, 2^{21021303301331} is an apocalyptic number.

21021303301331 is a deficient number, since it is larger than the sum of its proper divisors (1111257661).

21021303301331 is a wasteful number, since it uses less digits than its factorization.

21021303301331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111257660.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21021303301331 its reverse (13310330312012), we get a palindrome (34331633613343).

The spelling of 21021303301331 in words is "twenty-one trillion, twenty-one billion, three hundred three million, three hundred one thousand, three hundred thirty-one".