21201003020121 has 32 divisors (see below), whose sum is σ = 30089059372800. Its totient is φ = 13232449843200.

The previous prime is 21201003020107. The next prime is 21201003020147. The reversal of 21201003020121 is 12102030010212.

It is not a de Polignac number, because 21201003020121 - 2³⁸ = 20926125113177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201003020121.

It is not an unprimeable number, because it can be changed into a prime (21201003020321) 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 31 ways as a sum of consecutive naturals, for example, 5898075 + ... + 8785743.

It is an arithmetic number, because the mean of its divisors is an integer number (940283105400).

Almost surely, 2^{21201003020121} is an apocalyptic number.

It is an amenable number.

21201003020121 is a deficient number, since it is larger than the sum of its proper divisors (8888056352679).

21201003020121 is a wasteful number, since it uses less digits than its factorization.

21201003020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888449.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21201003020121 its reverse (12102030010212), we get a palindrome (33303033030333).

The spelling of 21201003020121 in words is "twenty-one trillion, two hundred one billion, three million, twenty thousand, one hundred twenty-one".