1021020120121 has 16 divisors (see below), whose sum is σ = 1135474387200. Its totient is φ = 914056835328.

The previous prime is 1021020120101. The next prime is 1021020120143. The reversal of 1021020120121 is 1210210201201.

It is a cyclic number.

It is not a de Polignac number, because 1021020120121 - 2¹¹ = 1021020118073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021020120101) 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, 19687200 + ... + 19738993.

It is an arithmetic number, because the mean of its divisors is an integer number (70967149200).

Almost surely, 2^{1021020120121} is an apocalyptic number.

It is an amenable number.

1021020120121 is a deficient number, since it is larger than the sum of its proper divisors (114454267079).

1021020120121 is a wasteful number, since it uses less digits than its factorization.

1021020120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39426288.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021020120121 its reverse (1210210201201), we get a palindrome (2231230321322).

The spelling of 1021020120121 in words is "one trillion, twenty-one billion, twenty million, one hundred twenty thousand, one hundred twenty-one".