1220121122021 has 8 divisors (see below), whose sum is σ = 1284452038080. Its totient is φ = 1155801607488.

The previous prime is 1220121121997. The next prime is 1220121122023. The reversal of 1220121122021 is 1202211210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220121122021 - 2³⁰ = 1219047380197 is a prime.

It is a super-2 number, since 2×1220121122021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121122023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2630276 + ... + 3059181.

It is an arithmetic number, because the mean of its divisors is an integer number (160556504760).

Almost surely, 2^{1220121122021} is an apocalyptic number.

It is an amenable number.

1220121122021 is a deficient number, since it is larger than the sum of its proper divisors (64330916059).

1220121122021 is a wasteful number, since it uses less digits than its factorization.

1220121122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700763.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220121122021 its reverse (1202211210221), we get a palindrome (2422332332242).

The spelling of 1220121122021 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".