21021222203 has 4 divisors (see below), whose sum is σ = 21023229240. Its totient is φ = 21019215168.

The previous prime is 21021222179. The next prime is 21021222221. The reversal of 21021222203 is 30222212012.

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 21021222203 - 2¹² = 21021218107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021222403) 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, 987725 + ... + 1008782.

It is an arithmetic number, because the mean of its divisors is an integer number (5255807310).

Almost surely, 2^21021222203 is an apocalyptic number.

21021222203 is a deficient number, since it is larger than the sum of its proper divisors (2007037).

21021222203 is a wasteful number, since it uses less digits than its factorization.

21021222203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007036.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21021222203 its reverse (30222212012), we get a palindrome (51243434215).

The spelling of 21021222203 in words is "twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred three".