21032011203121 has 4 divisors (see below), whose sum is σ = 22138959161200. Its totient is φ = 19925063245044.

The previous prime is 21032011203109. The next prime is 21032011203139. The reversal of 21032011203121 is 12130211023012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21032011203121 - 2¹⁵ = 21032011170353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1106947958059 = 21032011203121 / (2 + 1 + 0 + 3 + 2 + 0 + 1 + 1 + 2 + 0 + 3 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032011203521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553473979011 + ... + 553473979048.

It is an arithmetic number, because the mean of its divisors is an integer number (5534739790300).

Almost surely, 2^{21032011203121} is an apocalyptic number.

It is an amenable number.

21032011203121 is a deficient number, since it is larger than the sum of its proper divisors (1106947958079).

21032011203121 is a wasteful number, since it uses less digits than its factorization.

21032011203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106947958078.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21032011203121 its reverse (12130211023012), we get a palindrome (33162222226133).

The spelling of 21032011203121 in words is "twenty-one trillion, thirty-two billion, eleven million, two hundred three thousand, one hundred twenty-one".