21021223310 has 8 divisors (see below), whose sum is σ = 37838201976. Its totient is φ = 8408489320.

The previous prime is 21021223297. The next prime is 21021223331. The reversal of 21021223310 is 1332212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21021223310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051061156 + ... + 1051061175.

It is an arithmetic number, because the mean of its divisors is an integer number (4729775247).

Almost surely, 2^21021223310 is an apocalyptic number.

21021223310 is a deficient number, since it is larger than the sum of its proper divisors (16816978666).

21021223310 is a wasteful number, since it uses less digits than its factorization.

21021223310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102122338.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21021223310 its reverse (1332212012), we get a palindrome (22353435322).

The spelling of 21021223310 in words is "twenty-one billion, twenty-one million, two hundred twenty-three thousand, three hundred ten".