21220100003 has 4 divisors (see below), whose sum is σ = 21220398768. Its totient is φ = 21219801240.

The previous prime is 21220099991. The next prime is 21220100021. The reversal of 21220100003 is 30000102212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21220100003 - 2⁴ = 21220099987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220109003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25058 + ... + 207528.

It is an arithmetic number, because the mean of its divisors is an integer number (5305099692).

Almost surely, 2^21220100003 is an apocalyptic number.

21220100003 is a deficient number, since it is larger than the sum of its proper divisors (298765).

21220100003 is a wasteful number, since it uses less digits than its factorization.

21220100003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298764.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21220100003 its reverse (30000102212), we get a palindrome (51220202215).

The spelling of 21220100003 in words is "twenty-one billion, two hundred twenty million, one hundred thousand, three".