21001102003121 has 8 divisors (see below), whose sum is σ = 22106643160800. Its totient is φ = 19895582845440.

The previous prime is 21001102003099. The next prime is 21001102003153. The reversal of 21001102003121 is 12130020110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001102003121 - 2¹⁴ = 21001101986737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001102003096 and 21001102003105.

It is not an unprimeable number, because it can be changed into a prime (21001102003421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3522320 + ... + 7376241.

It is an arithmetic number, because the mean of its divisors is an integer number (2763330395100).

Almost surely, 2^{21001102003121} is an apocalyptic number.

It is an amenable number.

21001102003121 is a deficient number, since it is larger than the sum of its proper divisors (1105541157679).

21001102003121 is a wasteful number, since it uses less digits than its factorization.

21001102003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10999999.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21001102003121 its reverse (12130020110012), we get a palindrome (33131122113133).

The spelling of 21001102003121 in words is "twenty-one trillion, one billion, one hundred two million, three thousand, one hundred twenty-one".