21113430245 has 16 divisors (see below), whose sum is σ = 27691849728. Its totient is φ = 15384357120.

The previous prime is 21113430223. The next prime is 21113430253. The reversal of 21113430245 is 54203431112.

It is a happy number.

It is not a de Polignac number, because 21113430245 - 2¹⁰ = 21113429221 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 4003709 + ... + 4008978.

It is an arithmetic number, because the mean of its divisors is an integer number (1730740608).

Almost surely, 2^21113430245 is an apocalyptic number.

It is an amenable number.

21113430245 is a deficient number, since it is larger than the sum of its proper divisors (6578419483).

21113430245 is a wasteful number, since it uses less digits than its factorization.

21113430245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8012740.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21113430245 its reverse (54203431112), we get a palindrome (75316861357).

The spelling of 21113430245 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, two hundred forty-five".