21002132210121 has 20 divisors (see below), whose sum is σ = 31377601010052. Its totient is φ = 13999616049888.

The previous prime is 21002132210119. The next prime is 21002132210161. The reversal of 21002132210121 is 12101223120012.

21002132210121 is a `hidden beast` number, since 210 + 0 + 2 + 1 + 322 + 10 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17243787774096 + 3758344436025 = 4152564^2 + 1938645^2 .

It is not a de Polignac number, because 21002132210121 - 2¹ = 21002132210119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002132210094 and 21002132210103.

It is not an unprimeable number, because it can be changed into a prime (21002132210161) 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 19 ways as a sum of consecutive naturals, for example, 16084690 + ... + 17341323.

Almost surely, 2^{21002132210121} is an apocalyptic number.

It is an amenable number.

21002132210121 is a deficient number, since it is larger than the sum of its proper divisors (10375468799931).

21002132210121 is an equidigital number, since it uses as much as digits as its factorization.

21002132210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33433782 (or 33433773 counting only the distinct ones).

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

Adding to 21002132210121 its reverse (12101223120012), we get a palindrome (33103355330133).

The spelling of 21002132210121 in words is "twenty-one trillion, two billion, one hundred thirty-two million, two hundred ten thousand, one hundred twenty-one".