21121001101005 has 64 divisors (see below), whose sum is σ = 38409616896000. Its totient is φ = 9824774383872.

The previous prime is 21121001100919. The next prime is 21121001101021. The reversal of 21121001101005 is 50010110012112.

21121001101005 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21121001101005 - 2¹¹ = 21121001098957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6116485 + ... + 8924874.

It is an arithmetic number, because the mean of its divisors is an integer number (600150264000).

Almost surely, 2^{21121001101005} is an apocalyptic number.

It is an amenable number.

21121001101005 is a deficient number, since it is larger than the sum of its proper divisors (17288615794995).

21121001101005 is a wasteful number, since it uses less digits than its factorization.

21121001101005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15041778.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 21121001101005 its reverse (50010110012112), we get a palindrome (71131111113117).

The spelling of 21121001101005 in words is "twenty-one trillion, one hundred twenty-one billion, one million, one hundred one thousand, five".