21003402223 has 16 divisors (see below), whose sum is σ = 22460711616. Its totient is φ = 19591855360.

The previous prime is 21003402197. The next prime is 21003402283. The reversal of 21003402223 is 32220430012.

It is a cyclic number.

It is not a de Polignac number, because 21003402223 - 2⁹ = 21003401711 is a prime.

It is a super-2 number, since 2×21003402223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003402223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003402283) 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, 4007961 + ... + 4013197.

It is an arithmetic number, because the mean of its divisors is an integer number (1403794476).

Almost surely, 2^21003402223 is an apocalyptic number.

21003402223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21003402223 is a deficient number, since it is larger than the sum of its proper divisors (1457309393).

21003402223 is a wasteful number, since it uses less digits than its factorization.

21003402223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9554.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21003402223 its reverse (32220430012), we get a palindrome (53223832235).

The spelling of 21003402223 in words is "twenty-one billion, three million, four hundred two thousand, two hundred twenty-three".