2121102021222 has 24 divisors (see below), whose sum is σ = 4601108794464. Its totient is φ = 706205122704.

The previous prime is 2121102021197. The next prime is 2121102021251. The reversal of 2121102021222 is 2221202011212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2121102021195 and 2121102021204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69057918 + ... + 69088625.

It is an arithmetic number, because the mean of its divisors is an integer number (191712866436).

Almost surely, 2^{2121102021222} is an apocalyptic number.

2121102021222 is an abundant number, since it is smaller than the sum of its proper divisors (2480006773242).

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

2121102021222 is a wasteful number, since it uses less digits than its factorization.

2121102021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138147404 (or 138147401 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121102021222 its reverse (2221202011212), we get a palindrome (4342304032434).

The spelling of 2121102021222 in words is "two trillion, one hundred twenty-one billion, one hundred two million, twenty-one thousand, two hundred twenty-two".