21143223343 has 24 divisors (see below), whose sum is σ = 24065828640. Its totient is φ = 18539505600.

The previous prime is 21143223329. The next prime is 21143223347. The reversal of 21143223343 is 34332234112.

It is a happy number.

It is not a de Polignac number, because 21143223343 - 2¹³ = 21143215151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143223347) 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, 4338198 + ... + 4343068.

It is an arithmetic number, because the mean of its divisors is an integer number (1002742860).

Almost surely, 2^21143223343 is an apocalyptic number.

21143223343 is a deficient number, since it is larger than the sum of its proper divisors (2922605297).

21143223343 is a wasteful number, since it uses less digits than its factorization.

21143223343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159 (or 6148 counting only the distinct ones).

The product of its digits is 10368, while the sum is 28.

Adding to 21143223343 its reverse (34332234112), we get a palindrome (55475457455).

The spelling of 21143223343 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-three thousand, three hundred forty-three".