21212221210022 has 8 divisors (see below), whose sum is σ = 31818360701736. Its totient is φ = 10606100976112.

The previous prime is 21212221210021. The next prime is 21212221210087. The reversal of 21212221210022 is 22001212221212.

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 = 21212221209976 and 21212221210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212221210021) 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, 1642868 + ... + 6717399.

It is an arithmetic number, because the mean of its divisors is an integer number (3977295087717).

Almost surely, 2^{21212221210022} is an apocalyptic number.

21212221210022 is a deficient number, since it is larger than the sum of its proper divisors (10606139491714).

21212221210022 is a wasteful number, since it uses less digits than its factorization.

21212221210022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9628902.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212221210022 its reverse (22001212221212), we get a palindrome (43213433431234).

The spelling of 21212221210022 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, twenty-two".