1021221220122 has 24 divisors (see below), whose sum is σ = 2308847976864. Its totient is φ = 325606765704.

The previous prime is 1021221220087. The next prime is 1021221220133. The reversal of 1021221220122 is 2210221221201.

It is a happy number.

1021221220122 is a `hidden beast` number, since 102 + 1 + 221 + 220 + 122 = 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 = 1021221220095 and 1021221220104.

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, 1233358548 + ... + 1233359375.

It is an arithmetic number, because the mean of its divisors is an integer number (96201999036).

Almost surely, 2^{1021221220122} is an apocalyptic number.

1021221220122 is an abundant number, since it is smaller than the sum of its proper divisors (1287626756742).

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

1021221220122 is a wasteful number, since it uses less digits than its factorization.

1021221220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466717954 (or 2466717951 counting only the distinct ones).

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

Adding to 1021221220122 its reverse (2210221221201), we get a palindrome (3231442441323).

The spelling of 1021221220122 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".