21021220220222 has 4 divisors (see below), whose sum is σ = 31531830330336. Its totient is φ = 10510610110110.

The previous prime is 21021220220141. The next prime is 21021220220233. The reversal of 21021220220222 is 22202202212012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21021220220194 and 21021220220203.

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, 5255305055054 + ... + 5255305055057.

It is an arithmetic number, because the mean of its divisors is an integer number (7882957582584).

Almost surely, 2^{21021220220222} is an apocalyptic number.

21021220220222 is a deficient number, since it is larger than the sum of its proper divisors (10510610110114).

21021220220222 is a wasteful number, since it uses less digits than its factorization.

21021220220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510610110113.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21021220220222 its reverse (22202202212012), we get a palindrome (43223422432234).

The spelling of 21021220220222 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-two".