21013020410121 has 24 divisors (see below), whose sum is σ = 30906506502144. Its totient is φ = 13755093408000.

The previous prime is 21013020410119. The next prime is 21013020410243. The reversal of 21013020410121 is 12101402031012.

21013020410121 is a `hidden beast` number, since 2 + 1 + 0 + 130 + 2 + 0 + 410 + 121 = 666.

It is not a de Polignac number, because 21013020410121 - 2¹ = 21013020410119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21013020410094 and 21013020410103.

It is not an unprimeable number, because it can be changed into a prime (21013020410621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94652505 + ... + 94874246.

It is an arithmetic number, because the mean of its divisors is an integer number (1287771104256).

Almost surely, 2^{21013020410121} is an apocalyptic number.

It is an amenable number.

21013020410121 is a deficient number, since it is larger than the sum of its proper divisors (9893486092023).

21013020410121 is a wasteful number, since it uses less digits than its factorization.

21013020410121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189526981 (or 189526978 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21013020410121 its reverse (12101402031012), we get a palindrome (33114422441133).

The spelling of 21013020410121 in words is "twenty-one trillion, thirteen billion, twenty million, four hundred ten thousand, one hundred twenty-one".