21121002101121 has 32 divisors (see below), whose sum is σ = 30493105267968. Its totient is φ = 12926763663360.

The previous prime is 21121002101099. The next prime is 21121002101123. The reversal of 21121002101121 is 12110120012112.

It is a happy number.

It is not a de Polignac number, because 21121002101121 - 2¹¹ = 21121002099073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121002101121.

It is not an unprimeable number, because it can be changed into a prime (21121002101123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4781020 + ... + 8068466.

It is an arithmetic number, because the mean of its divisors is an integer number (952909539624).

Almost surely, 2^{21121002101121} is an apocalyptic number.

It is an amenable number.

21121002101121 is a deficient number, since it is larger than the sum of its proper divisors (9372103166847).

21121002101121 is a wasteful number, since it uses less digits than its factorization.

21121002101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288361.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121002101121 its reverse (12110120012112), we get a palindrome (33231122113233).

The spelling of 21121002101121 in words is "twenty-one trillion, one hundred twenty-one billion, two million, one hundred one thousand, one hundred twenty-one".