21122503403201 has 4 divisors (see below), whose sum is σ = 21133780769412. Its totient is φ = 21111226036992.

The previous prime is 21122503403167. The next prime is 21122503403273. The reversal of 21122503403201 is 10230430522112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6942044570176 + 14180458833025 = 2634776^2 + 3765695^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122503403201 - 2¹⁰ = 21122503402177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122503403401) 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, 5638680296 + ... + 5638684041.

It is an arithmetic number, because the mean of its divisors is an integer number (5283445192353).

Almost surely, 2^{21122503403201} is an apocalyptic number.

It is an amenable number.

21122503403201 is a deficient number, since it is larger than the sum of its proper divisors (11277366211).

21122503403201 is a wasteful number, since it uses less digits than its factorization.

21122503403201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11277366210.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21122503403201 its reverse (10230430522112), we get a palindrome (31352933925313).

The spelling of 21122503403201 in words is "twenty-one trillion, one hundred twenty-two billion, five hundred three million, four hundred three thousand, two hundred one".