101011020121021 has 4 divisors (see below), whose sum is σ = 101132866949500. Its totient is φ = 100889173292544.

The previous prime is 101011020120991. The next prime is 101011020121049. The reversal of 101011020121021 is 120121020110101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24061036092025 + 76949984028996 = 4905205^2 + 8772114^2 .

It is a cyclic number.

It is not a de Polignac number, because 101011020121021 - 2⁹ = 101011020120509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101011020120992 and 101011020121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101011020121061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60923412996 + ... + 60923414653.

It is an arithmetic number, because the mean of its divisors is an integer number (25283216737375).

Almost surely, 2^{101011020121021} is an apocalyptic number.

It is an amenable number.

101011020121021 is a deficient number, since it is larger than the sum of its proper divisors (121846828479).

101011020121021 is an equidigital number, since it uses as much as digits as its factorization.

101011020121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121846828478.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 101011020121021 its reverse (120121020110101), we get a palindrome (221132040231122).

The spelling of 101011020121021 in words is "one hundred one trillion, eleven billion, twenty million, one hundred twenty-one thousand, twenty-one".