1021120121221 has 16 divisors (see below), whose sum is σ = 1043320072320. Its totient is φ = 999178048000.

The previous prime is 1021120121167. The next prime is 1021120121233. The reversal of 1021120121221 is 1221210211201.

1021120121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1021120121221 - 2⁷ = 1021120121093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021120121195 and 1021120121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120121321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9249096 + ... + 9358846.

It is an arithmetic number, because the mean of its divisors is an integer number (65207504520).

Almost surely, 2^{1021120121221} is an apocalyptic number.

It is an amenable number.

1021120121221 is a deficient number, since it is larger than the sum of its proper divisors (22199951099).

1021120121221 is a wasteful number, since it uses less digits than its factorization.

1021120121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110924.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1021120121221 its reverse (1221210211201), we get a palindrome (2242330332422).

The spelling of 1021120121221 in words is "one trillion, twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".