21213312341 has 16 divisors (see below), whose sum is σ = 23654949360. Its totient is φ = 18888629760.

The previous prime is 21213312319. The next prime is 21213312343. The reversal of 21213312341 is 14321331212.

It can be written as a sum of positive squares in 8 ways, for example, as 555025 + 21212757316 = 745^2 + 145646^2 .

It is not a de Polignac number, because 21213312341 - 2³⁴ = 4033443157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213312343) 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, 386321 + ... + 437801.

It is an arithmetic number, because the mean of its divisors is an integer number (1478434335).

Almost surely, 2^21213312341 is an apocalyptic number.

It is an amenable number.

21213312341 is a deficient number, since it is larger than the sum of its proper divisors (2441637019).

21213312341 is a wasteful number, since it uses less digits than its factorization.

21213312341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52616.

The product of its digits is 864, while the sum is 23.

Adding to 21213312341 its reverse (14321331212), we get a palindrome (35534643553).

The spelling of 21213312341 in words is "twenty-one billion, two hundred thirteen million, three hundred twelve thousand, three hundred forty-one".