21211540343 has 24 divisors (see below), whose sum is σ = 24881745792. Its totient is φ = 17713162224.

The previous prime is 21211540333. The next prime is 21211540387. The reversal of 21211540343 is 34304511212.

It is a happy number.

It is not a de Polignac number, because 21211540343 - 2⁶ = 21211540279 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 (21211540333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3507080 + ... + 3513122.

It is an arithmetic number, because the mean of its divisors is an integer number (1036739408).

Almost surely, 2^21211540343 is an apocalyptic number.

21211540343 is a deficient number, since it is larger than the sum of its proper divisors (3670205449).

21211540343 is an equidigital number, since it uses as much as digits as its factorization.

21211540343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371 (or 6324 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 21211540343 in words is "twenty-one billion, two hundred eleven million, five hundred forty thousand, three hundred forty-three".