21010020201121 has 16 divisors (see below), whose sum is σ = 24322107801600. Its totient is φ = 17775722519568.

The previous prime is 21010020201103. The next prime is 21010020201167. The reversal of 21010020201121 is 12110202001012.

It is a cyclic number.

It is not a de Polignac number, because 21010020201121 - 2³¹ = 21007872717473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010020202121) 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, 3239761 + ... + 7246798.

It is an arithmetic number, because the mean of its divisors is an integer number (1520131737600).

Almost surely, 2^{21010020201121} is an apocalyptic number.

It is an amenable number.

21010020201121 is a deficient number, since it is larger than the sum of its proper divisors (3312087600479).

21010020201121 is a wasteful number, since it uses less digits than its factorization.

21010020201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10490268.

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

Adding to 21010020201121 its reverse (12110202001012), we get a palindrome (33120222202133).

The spelling of 21010020201121 in words is "twenty-one trillion, ten billion, twenty million, two hundred one thousand, one hundred twenty-one".