21000022303 has 16 divisors (see below), whose sum is σ = 22902264000. Its totient is φ = 19254237600.

The previous prime is 21000022301. The next prime is 21000022331. The reversal of 21000022303 is 30322000012.

It is a happy number.

It is not a de Polignac number, because 21000022303 - 2¹ = 21000022301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000022301) 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, 295278 + ... + 359428.

It is an arithmetic number, because the mean of its divisors is an integer number (1431391500).

Almost surely, 2^21000022303 is an apocalyptic number.

21000022303 is a deficient number, since it is larger than the sum of its proper divisors (1902241697).

21000022303 is an equidigital number, since it uses as much as digits as its factorization.

21000022303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64339 (or 64313 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21000022303 its reverse (30322000012), we get a palindrome (51322022315).

The spelling of 21000022303 in words is "twenty-one billion, twenty-two thousand, three hundred three".