21102312434 has 32 divisors (see below), whose sum is σ = 37439297280. Its totient is φ = 8728147008.

The previous prime is 21102312431. The next prime is 21102312443. The reversal of 21102312434 is 43421320112.

It is not an unprimeable number, because it can be changed into a prime (21102312431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027979 + ... + 1048305.

It is an arithmetic number, because the mean of its divisors is an integer number (1169978040).

Almost surely, 2^21102312434 is an apocalyptic number.

21102312434 is a deficient number, since it is larger than the sum of its proper divisors (16336984846).

21102312434 is a wasteful number, since it uses less digits than its factorization.

21102312434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22922.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21102312434 its reverse (43421320112), we get a palindrome (64523632546).

The spelling of 21102312434 in words is "twenty-one billion, one hundred two million, three hundred twelve thousand, four hundred thirty-four".