21211221003 has 8 divisors (see below), whose sum is σ = 32321860608. Its totient is φ = 12120697704.

The previous prime is 21211220993. The next prime is 21211221019. The reversal of 21211221003 is 30012211212.

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

It is not a de Polignac number, because 21211221003 - 2⁹ = 21211220491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211221403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505029051 + ... + 505029092.

It is an arithmetic number, because the mean of its divisors is an integer number (4040232576).

Almost surely, 2^21211221003 is an apocalyptic number.

21211221003 is a deficient number, since it is larger than the sum of its proper divisors (11110639605).

21211221003 is a wasteful number, since it uses less digits than its factorization.

21211221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010058153.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21211221003 its reverse (30012211212), we get a palindrome (51223432215).

The spelling of 21211221003 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, three".