21121001203005 has 128 divisors (see below), whose sum is σ = 41988966727680. Its totient is φ = 9984062016000.

The previous prime is 21121001202989. The next prime is 21121001203037. The reversal of 21121001203005 is 50030210012112.

It is not a de Polignac number, because 21121001203005 - 2⁴ = 21121001202989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 91882444 + ... + 92112026.

It is an arithmetic number, because the mean of its divisors is an integer number (328038802560).

Almost surely, 2^{21121001203005} is an apocalyptic number.

It is an amenable number.

21121001203005 is a deficient number, since it is larger than the sum of its proper divisors (20867965524675).

21121001203005 is a wasteful number, since it uses less digits than its factorization.

21121001203005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231160 (or 231154 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21121001203005 its reverse (50030210012112), we get a palindrome (71151211215117).

The spelling of 21121001203005 in words is "twenty-one trillion, one hundred twenty-one billion, one million, two hundred three thousand, five".