21220144312201 has 4 divisors (see below), whose sum is σ = 21220189446400. Its totient is φ = 21220099178004.

The previous prime is 21220144312183. The next prime is 21220144312249. The reversal of 21220144312201 is 10221344102212.

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 21220144312201 - 2⁹ = 21220144311689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220144316201) 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, 21854361 + ... + 22804678.

It is an arithmetic number, because the mean of its divisors is an integer number (5305047361600).

Almost surely, 2^{21220144312201} is an apocalyptic number.

It is an amenable number.

21220144312201 is a deficient number, since it is larger than the sum of its proper divisors (45134199).

21220144312201 is an equidigital number, since it uses as much as digits as its factorization.

21220144312201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45134198.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21220144312201 its reverse (10221344102212), we get a palindrome (31441488414413).

The spelling of 21220144312201 in words is "twenty-one trillion, two hundred twenty billion, one hundred forty-four million, three hundred twelve thousand, two hundred one".