21102300243 has 24 divisors (see below), whose sum is σ = 33146388288. Its totient is φ = 12882799872.

The previous prime is 21102300221. The next prime is 21102300257. The reversal of 21102300243 is 34200320112.

21102300243 is a `hidden beast` number, since 21 + 102 + 300 + 243 = 666.

It is not a de Polignac number, because 21102300243 - 2⁵ = 21102300211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102300343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1858171 + ... + 1869492.

It is an arithmetic number, because the mean of its divisors is an integer number (1381099512).

Almost surely, 2^21102300243 is an apocalyptic number.

21102300243 is a deficient number, since it is larger than the sum of its proper divisors (12044088045).

21102300243 is a wasteful number, since it uses less digits than its factorization.

21102300243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727723 (or 3727720 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21102300243 its reverse (34200320112), we get a palindrome (55302620355).

The spelling of 21102300243 in words is "twenty-one billion, one hundred two million, three hundred thousand, two hundred forty-three".