21220144341 has 16 divisors (see below), whose sum is σ = 30903026688. Its totient is φ = 12845126000.

The previous prime is 21220144331. The next prime is 21220144343. The reversal of 21220144341 is 14344102212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220144341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220144343) 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, 361485 + ... + 416066.

It is an arithmetic number, because the mean of its divisors is an integer number (1931439168).

Almost surely, 2^21220144341 is an apocalyptic number.

It is an amenable number.

21220144341 is a deficient number, since it is larger than the sum of its proper divisors (9682882347).

21220144341 is a wasteful number, since it uses less digits than its factorization.

21220144341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778392.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21220144341 its reverse (14344102212), we get a palindrome (35564246553).

It can be divided in two parts, 21220 and 144341, that added together give a palindrome (165561).

The spelling of 21220144341 in words is "twenty-one billion, two hundred twenty million, one hundred forty-four thousand, three hundred forty-one".