21121022201121 has 8 divisors (see below), whose sum is σ = 31290403260960. Its totient is φ = 14080681467396.

The previous prime is 21121022201099. The next prime is 21121022201129. The reversal of 21121022201121 is 12110222012112.

21121022201121 is a `hidden beast` number, since 211 + 210 + 2 + 220 + 1 + 1 + 21 = 666.

It is not a de Polignac number, because 21121022201121 - 2¹¹ = 21121022199073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121022201094 and 21121022201103.

It is not an unprimeable number, because it can be changed into a prime (21121022201129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391130040735 + ... + 391130040788.

It is an arithmetic number, because the mean of its divisors is an integer number (3911300407620).

Almost surely, 2^{21121022201121} is an apocalyptic number.

It is an amenable number.

21121022201121 is a deficient number, since it is larger than the sum of its proper divisors (10169381059839).

21121022201121 is an equidigital number, since it uses as much as digits as its factorization.

21121022201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782260081532 (or 782260081526 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121022201121 its reverse (12110222012112), we get a palindrome (33231244213233).

The spelling of 21121022201121 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, two hundred one thousand, one hundred twenty-one".