21121342341 has 16 divisors (see below), whose sum is σ = 30748653120. Its totient is φ = 12789688320.

The previous prime is 21121342339. The next prime is 21121342357. The reversal of 21121342341 is 14324312112.

It is not a de Polignac number, because 21121342341 - 2¹ = 21121342339 is a prime.

It is a super-2 number, since 2×21121342341² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121342391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239506 + ... + 315603.

It is an arithmetic number, because the mean of its divisors is an integer number (1921790820).

Almost surely, 2^21121342341 is an apocalyptic number.

It is an amenable number.

21121342341 is a deficient number, since it is larger than the sum of its proper divisors (9627310779).

21121342341 is a wasteful number, since it uses less digits than its factorization.

21121342341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556276.

The product of its digits is 1152, while the sum is 24.

Adding to 21121342341 its reverse (14324312112), we get a palindrome (35445654453).

The spelling of 21121342341 in words is "twenty-one billion, one hundred twenty-one million, three hundred forty-two thousand, three hundred forty-one".