21224400343 has 2 divisors, whose sum is σ = 21224400344. Its totient is φ = 21224400342.

The previous prime is 21224400331. The next prime is 21224400371. The reversal of 21224400343 is 34300442212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21224400343 - 2²⁹ = 20687529431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224400443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612200171 + 10612200172.

It is an arithmetic number, because the mean of its divisors is an integer number (10612200172).

Almost surely, 2^21224400343 is an apocalyptic number.

21224400343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224400343 is an equidigital number, since it uses as much as digits as its factorization.

21224400343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21224400343 its reverse (34300442212), we get a palindrome (55524842555).

The spelling of 21224400343 in words is "twenty-one billion, two hundred twenty-four million, four hundred thousand, three hundred forty-three".