21121233343 has 16 divisors (see below), whose sum is σ = 24323950080. Its totient is φ = 17965289376.

The previous prime is 21121233323. The next prime is 21121233383. The reversal of 21121233343 is 34333212112.

It is a cyclic number.

It is not a de Polignac number, because 21121233343 - 2⁵ = 21121233311 is a prime.

It is a super-2 number, since 2×21121233343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121233323) 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, 592905 + ... + 627517.

It is an arithmetic number, because the mean of its divisors is an integer number (1520246880).

Almost surely, 2^21121233343 is an apocalyptic number.

21121233343 is a deficient number, since it is larger than the sum of its proper divisors (3202716737).

21121233343 is a wasteful number, since it uses less digits than its factorization.

21121233343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35286.

The product of its digits is 2592, while the sum is 25.

Adding to 21121233343 its reverse (34333212112), we get a palindrome (55454445455).

The spelling of 21121233343 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirty-three thousand, three hundred forty-three".