21201222220222 has 8 divisors (see below), whose sum is σ = 34692909087672. Its totient is φ = 9636919191000.

The previous prime is 21201222220151. The next prime is 21201222220249. The reversal of 21201222220222 is 22202222210212.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 963691919101 = 21201222220222 / (2 + 1 + 2 + 0 + 1 + 2 + 2 + 2 + 2 + 2 + 0 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21201222220193 and 21201222220202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481845959529 + ... + 481845959572.

It is an arithmetic number, because the mean of its divisors is an integer number (4336613635959).

Almost surely, 2^{21201222220222} is an apocalyptic number.

21201222220222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21201222220222 is a deficient number, since it is larger than the sum of its proper divisors (13491686867450).

21201222220222 is a wasteful number, since it uses less digits than its factorization.

21201222220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963691919114.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21201222220222 its reverse (22202222210212), we get a palindrome (43403444430434).

The spelling of 21201222220222 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-two".