21214242241 has 4 divisors (see below), whose sum is σ = 21401979012. Its totient is φ = 21026505472.

The previous prime is 21214242233. The next prime is 21214242271. The reversal of 21214242241 is 14224241212.

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 5267856400 + 15946385841 = 72580^2 + 126279^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214242241 - 2³ = 21214242233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214242271) 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, 93868216 + ... + 93868441.

It is an arithmetic number, because the mean of its divisors is an integer number (5350494753).

Almost surely, 2^21214242241 is an apocalyptic number.

It is an amenable number.

21214242241 is a deficient number, since it is larger than the sum of its proper divisors (187736771).

21214242241 is a wasteful number, since it uses less digits than its factorization.

21214242241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187736770.

The product of its digits is 2048, while the sum is 25.

Adding to 21214242241 its reverse (14224241212), we get a palindrome (35438483453).

The spelling of 21214242241 in words is "twenty-one billion, two hundred fourteen million, two hundred forty-two thousand, two hundred forty-one".