21221211111022 has 8 divisors (see below), whose sum is σ = 34280417948616. Its totient is φ = 9794405128152.

The previous prime is 21221211111017. The next prime is 21221211111029. The reversal of 21221211111022 is 22011111212212.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221211111029) 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, 408100213648 + ... + 408100213699.

It is an arithmetic number, because the mean of its divisors is an integer number (4285052243577).

Almost surely, 2^{21221211111022} is an apocalyptic number.

21221211111022 is a deficient number, since it is larger than the sum of its proper divisors (13059206837594).

21221211111022 is a wasteful number, since it uses less digits than its factorization.

21221211111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816200427362.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21221211111022 its reverse (22011111212212), we get a palindrome (43232322323234).

The spelling of 21221211111022 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, twenty-two".