21400302243 has 8 divisors (see below), whose sum is σ = 30035512000. Its totient is φ = 13515980328.

The previous prime is 21400302241. The next prime is 21400302257. The reversal of 21400302243 is 34220300412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21400302243 - 2¹ = 21400302241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400302241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187721893 + ... + 187722006.

It is an arithmetic number, because the mean of its divisors is an integer number (3754439000).

Almost surely, 2^21400302243 is an apocalyptic number.

21400302243 is a deficient number, since it is larger than the sum of its proper divisors (8635209757).

21400302243 is a wasteful number, since it uses less digits than its factorization.

21400302243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375443921.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21400302243 its reverse (34220300412), we get a palindrome (55620602655).

The spelling of 21400302243 in words is "twenty-one billion, four hundred million, three hundred two thousand, two hundred forty-three".