121221021222222 has 128 divisors (see below), whose sum is σ = 263920740610560. Its totient is φ = 36997310338560.

The previous prime is 121221021222137. The next prime is 121221021222263. The reversal of 121221021222222 is 222222120122121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121221021222192 and 121221021222201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 184641768 + ... + 185297124.

It is an arithmetic number, because the mean of its divisors is an integer number (2061880786020).

Almost surely, 2^{121221021222222} is an apocalyptic number.

121221021222222 is an abundant number, since it is smaller than the sum of its proper divisors (142699719388338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221021222222 is a wasteful number, since it uses less digits than its factorization.

121221021222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655906.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 121221021222222 its reverse (222222120122121), we get a palindrome (343443141344343).

The spelling of 121221021222222 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".