21343121430 has 16 divisors (see below), whose sum is σ = 51223491504. Its totient is φ = 5691499040.

The previous prime is 21343121407. The next prime is 21343121431. The reversal of 21343121430 is 3412134312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343121430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343121431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355718661 + ... + 355718720.

It is an arithmetic number, because the mean of its divisors is an integer number (3201468219).

Almost surely, 2^21343121430 is an apocalyptic number.

21343121430 is an abundant number, since it is smaller than the sum of its proper divisors (29880370074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343121430 is a wasteful number, since it uses less digits than its factorization.

21343121430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711437391.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21343121430 its reverse (3412134312), we get a palindrome (24755255742).

The spelling of 21343121430 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-one thousand, four hundred thirty".