21402220330241 has 16 divisors (see below), whose sum is σ = 22759634489040. Its totient is φ = 20055858493440.

The previous prime is 21402220330229. The next prime is 21402220330243. The reversal of 21402220330241 is 14203302220412.

It can be written as a sum of positive squares in 8 ways, for example, as 3653660217025 + 17748560113216 = 1911455^2 + 4212904^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402220330241 - 2²⁶ = 21402153221377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21402220330241.

It is not an unprimeable number, because it can be changed into a prime (21402220330243) 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, 4346015 + ... + 7854443.

It is an arithmetic number, because the mean of its divisors is an integer number (1422477155565).

Almost surely, 2^{21402220330241} is an apocalyptic number.

It is an amenable number.

21402220330241 is a deficient number, since it is larger than the sum of its proper divisors (1357414158799).

21402220330241 is a wasteful number, since it uses less digits than its factorization.

21402220330241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510004.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21402220330241 its reverse (14203302220412), we get a palindrome (35605522550653).

The spelling of 21402220330241 in words is "twenty-one trillion, four hundred two billion, two hundred twenty million, three hundred thirty thousand, two hundred forty-one".