21455203222 has 4 divisors (see below), whose sum is σ = 32182804836. Its totient is φ = 10727601610.

The previous prime is 21455203219. The next prime is 21455203247. The reversal of 21455203222 is 22230255412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363800804 + ... + 5363800807.

It is an arithmetic number, because the mean of its divisors is an integer number (8045701209).

Almost surely, 2^21455203222 is an apocalyptic number.

21455203222 is a deficient number, since it is larger than the sum of its proper divisors (10727601614).

21455203222 is a wasteful number, since it uses less digits than its factorization.

21455203222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10727601613.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 21455203222 its reverse (22230255412), we get a palindrome (43685458634).

The spelling of 21455203222 in words is "twenty-one billion, four hundred fifty-five million, two hundred three thousand, two hundred twenty-two".