21211021211222 has 8 divisors (see below), whose sum is σ = 31894322849400. Its totient is φ = 10579580261424.

The previous prime is 21211021211209. The next prime is 21211021211243. The reversal of 21211021211222 is 22211212011212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21211021211194 and 21211021211203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12965171072 + ... + 12965172707.

It is an arithmetic number, because the mean of its divisors is an integer number (3986790356175).

Almost surely, 2^{21211021211222} is an apocalyptic number.

21211021211222 is a deficient number, since it is larger than the sum of its proper divisors (10683301638178).

21211021211222 is a wasteful number, since it uses less digits than its factorization.

21211021211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25930344190.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21211021211222 its reverse (22211212011212), we get a palindrome (43422233222434).

The spelling of 21211021211222 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, two hundred eleven thousand, two hundred twenty-two".