21221020003 has 4 divisors (see below), whose sum is σ = 21459458520. Its totient is φ = 20982581488.

The previous prime is 21221019979. The next prime is 21221020021. The reversal of 21221020003 is 30002012212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221020003 - 2⁵ = 21221019971 is a prime.

It is a super-2 number, since 2×21221020003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221026003) 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, 119219125 + ... + 119219302.

It is an arithmetic number, because the mean of its divisors is an integer number (5364864630).

Almost surely, 2^21221020003 is an apocalyptic number.

21221020003 is a deficient number, since it is larger than the sum of its proper divisors (238438517).

21221020003 is an equidigital number, since it uses as much as digits as its factorization.

21221020003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238438516.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21221020003 its reverse (30002012212), we get a palindrome (51223032215).

The spelling of 21221020003 in words is "twenty-one billion, two hundred twenty-one million, twenty thousand, three".