1221020122122 has 64 divisors (see below), whose sum is σ = 2875755916800. Its totient is φ = 382696151040.

The previous prime is 1221020122097. The next prime is 1221020122123. The reversal of 1221020122122 is 2212210201221.

It is a happy number.

1221020122122 is a `hidden beast` number, since 1 + 221 + 0 + 201 + 221 + 22 = 666.

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 = 1221020122095 and 1221020122104.

It is not an unprimeable number, because it can be changed into a prime (1221020122123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313722 + ... + 1593882.

It is an arithmetic number, because the mean of its divisors is an integer number (44933686200).

Almost surely, 2^{1221020122122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221020122122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1437877958400).

1221020122122 is an abundant number, since it is smaller than the sum of its proper divisors (1654735794678).

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

1221020122122 is a wasteful number, since it uses less digits than its factorization.

1221020122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281228 (or 1281222 counting only the distinct ones).

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

Adding to 1221020122122 its reverse (2212210201221), we get a palindrome (3433230323343).

It can be divided in two parts, 12210201221 and 22, that multiplied together give a palindrome (268624426862).

The spelling of 1221020122122 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-two".