21102012001121 has 4 divisors (see below), whose sum is σ = 21160791979200. Its totient is φ = 21043232023044.

The previous prime is 21102012001073. The next prime is 21102012001139. The reversal of 21102012001121 is 12110021020112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21102012001121 - 2³⁸ = 20827134094177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102012001096 and 21102012001105.

It is not an unprimeable number, because it can be changed into a prime (21102012001141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29389988501 + ... + 29389989218.

It is an arithmetic number, because the mean of its divisors is an integer number (5290197994800).

Almost surely, 2^{21102012001121} is an apocalyptic number.

It is an amenable number.

21102012001121 is a deficient number, since it is larger than the sum of its proper divisors (58779978079).

21102012001121 is an equidigital number, since it uses as much as digits as its factorization.

21102012001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58779978078.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102012001121 its reverse (12110021020112), we get a palindrome (33212033021233).

The spelling of 21102012001121 in words is "twenty-one trillion, one hundred two billion, twelve million, one thousand, one hundred twenty-one".