21203512022441 has 4 divisors (see below), whose sum is σ = 24232585168512. Its totient is φ = 18174438876372.

The previous prime is 21203512022419. The next prime is 21203512022461. The reversal of 21203512022441 is 14422021530212.

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 21203512022441 - 2³⁴ = 21186332153257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203512022401) 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 3 ways as a sum of consecutive naturals, for example, 1514536573025 + ... + 1514536573038.

It is an arithmetic number, because the mean of its divisors is an integer number (6058146292128).

Almost surely, 2^{21203512022441} is an apocalyptic number.

It is an amenable number.

21203512022441 is a deficient number, since it is larger than the sum of its proper divisors (3029073146071).

21203512022441 is an equidigital number, since it uses as much as digits as its factorization.

21203512022441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029073146070.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21203512022441 its reverse (14422021530212), we get a palindrome (35625533552653).

The spelling of 21203512022441 in words is "twenty-one trillion, two hundred three billion, five hundred twelve million, twenty-two thousand, four hundred forty-one".