21203544025101 has 16 divisors (see below), whose sum is σ = 28353332551680. Its totient is φ = 14094746917680.

The previous prime is 21203544025093. The next prime is 21203544025117. The reversal of 21203544025101 is 10152044530212.

It is not a de Polignac number, because 21203544025101 - 2³ = 21203544025093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203544025121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1368090 + ... + 6654228.

It is an arithmetic number, because the mean of its divisors is an integer number (1772083284480).

Almost surely, 2^{21203544025101} is an apocalyptic number.

It is an amenable number.

21203544025101 is a deficient number, since it is larger than the sum of its proper divisors (7149788526579).

21203544025101 is a wasteful number, since it uses less digits than its factorization.

21203544025101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290016.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21203544025101 its reverse (10152044530212), we get a palindrome (31355588555313).

The spelling of 21203544025101 in words is "twenty-one trillion, two hundred three billion, five hundred forty-four million, twenty-five thousand, one hundred one".