10021020121 has 16 divisors (see below), whose sum is σ = 12068875008. Its totient is φ = 8134632000.

The previous prime is 10021020089. The next prime is 10021020131. The reversal of 10021020121 is 12102012001.

It is a cyclic number.

It is not a de Polignac number, because 10021020121 - 2⁵ = 10021020089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021020098 and 10021020107.

It is not an unprimeable number, because it can be changed into a prime (10021020131) 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, 291870 + ... + 324391.

It is an arithmetic number, because the mean of its divisors is an integer number (754304688).

Almost surely, 2^10021020121 is an apocalyptic number.

It is an amenable number.

10021020121 is a deficient number, since it is larger than the sum of its proper divisors (2047854887).

10021020121 is a wasteful number, since it uses less digits than its factorization.

10021020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616392.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10021020121 its reverse (12102012001), we get a palindrome (22123032122).

The spelling of 10021020121 in words is "ten billion, twenty-one million, twenty thousand, one hundred twenty-one".