21123341430 has 32 divisors (see below), whose sum is σ = 50893298784. Its totient is φ = 5610971136.

The previous prime is 21123341429. The next prime is 21123341471. The reversal of 21123341430 is 3414332112.

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 21123341430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362157 + ... + 1377576.

It is an arithmetic number, because the mean of its divisors is an integer number (1590415587).

Almost surely, 2^21123341430 is an apocalyptic number.

21123341430 is an abundant number, since it is smaller than the sum of its proper divisors (29769957354).

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

21123341430 is a wasteful number, since it uses less digits than its factorization.

21123341430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740000.

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

Adding to 21123341430 its reverse (3414332112), we get a palindrome (24537673542).

The spelling of 21123341430 in words is "twenty-one billion, one hundred twenty-three million, three hundred forty-one thousand, four hundred thirty".