1020121001021 has 16 divisors (see below), whose sum is σ = 1044873903744. Its totient is φ = 995574250944.

The previous prime is 1020121000949. The next prime is 1020121001027. The reversal of 1020121001021 is 1201001210201.

It is a cyclic number.

It is not a de Polignac number, because 1020121001021 - 2¹⁴ = 1020120984637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121000993 and 1020121001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68516840 + ... + 68531726.

It is an arithmetic number, because the mean of its divisors is an integer number (65304618984).

Almost surely, 2^{1020121001021} is an apocalyptic number.

It is an amenable number.

1020121001021 is a deficient number, since it is larger than the sum of its proper divisors (24752902723).

1020121001021 is a wasteful number, since it uses less digits than its factorization.

1020121001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21700.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1020121001021 its reverse (1201001210201), we get a palindrome (2221122211222).

The spelling of 1020121001021 in words is "one trillion, twenty billion, one hundred twenty-one million, one thousand, twenty-one".