21022021013 has 32 divisors (see below), whose sum is σ = 24960960000. Its totient is φ = 17693531520.

The previous prime is 21022021003. The next prime is 21022021037. The reversal of 21022021013 is 31012022012.

It is a happy number.

It is not a de Polignac number, because 21022021013 - 2¹⁴ = 21022004629 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 (21022021003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6549353 + ... + 6552561.

It is an arithmetic number, because the mean of its divisors is an integer number (780030000).

Almost surely, 2^21022021013 is an apocalyptic number.

It is an amenable number.

21022021013 is a deficient number, since it is larger than the sum of its proper divisors (3938938987).

21022021013 is an equidigital number, since it uses as much as digits as its factorization.

21022021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570 (or 3556 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21022021013 its reverse (31012022012), we get a palindrome (52034043025).

Subtracting 21022021013 from its reverse (31012022012), we obtain a palindrome (9990000999).

The spelling of 21022021013 in words is "twenty-one billion, twenty-two million, twenty-one thousand, thirteen".