1220122212021 has 24 divisors (see below), whose sum is σ = 1839232624320. Its totient is φ = 777961014336.

The previous prime is 1220122212019. The next prime is 1220122212047. The reversal of 1220122212021 is 1202122210221.

It is a happy number.

It is not a de Polignac number, because 1220122212021 - 2¹ = 1220122212019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220122211985 and 1220122212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122212061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1527990 + ... + 2185176.

It is an arithmetic number, because the mean of its divisors is an integer number (76634692680).

Almost surely, 2^{1220122212021} is an apocalyptic number.

It is an amenable number.

1220122212021 is a deficient number, since it is larger than the sum of its proper divisors (619110412299).

1220122212021 is a wasteful number, since it uses less digits than its factorization.

1220122212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666185 (or 666182 counting only the distinct ones).

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

Adding to 1220122212021 its reverse (1202122210221), we get a palindrome (2422244422242).

The spelling of 1220122212021 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".