21213320241 has 16 divisors (see below), whose sum is σ = 29870086400. Its totient is φ = 13354234128.

The previous prime is 21213320237. The next prime is 21213320291. The reversal of 21213320241 is 14202331212.

It is not a de Polignac number, because 21213320241 - 2² = 21213320237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213320221) 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, 588631 + ... + 623628.

It is an arithmetic number, because the mean of its divisors is an integer number (1866880400).

Almost surely, 2^21213320241 is an apocalyptic number.

It is an amenable number.

21213320241 is a deficient number, since it is larger than the sum of its proper divisors (8656766159).

21213320241 is a wasteful number, since it uses less digits than its factorization.

21213320241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212588.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21213320241 its reverse (14202331212), we get a palindrome (35415651453).

The spelling of 21213320241 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred forty-one".