21110346436 has 9 divisors (see below), whose sum is σ = 36943614799. Its totient is φ = 10555027924.

The previous prime is 21110346421. The next prime is 21110346461. The reversal of 21110346436 is 63464301112.

It is a happy number.

The square root of 21110346436 is 145294.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110346398 and 21110346407.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 254265 + ... + 326911.

Almost surely, 2^21110346436 is an apocalyptic number.

21110346436 is the 145294-th square number.

It is an amenable number.

21110346436 is a deficient number, since it is larger than the sum of its proper divisors (15833268363).

21110346436 is an frugal number, since it uses more digits than its factorization.

21110346436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145298 (or 72649 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21110346436 its reverse (63464301112), we get a palindrome (84574647548).

The spelling of 21110346436 in words is "twenty-one billion, one hundred ten million, three hundred forty-six thousand, four hundred thirty-six".