21416136243 has 16 divisors (see below), whose sum is σ = 28729075200. Its totient is φ = 14190564960.

The previous prime is 21416136239. The next prime is 21416136271. The reversal of 21416136243 is 34263161412.

It is a happy number.

It is not a de Polignac number, because 21416136243 - 2² = 21416136239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21416136233) 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, 309213 + ... + 372081.

It is an arithmetic number, because the mean of its divisors is an integer number (1795567200).

Almost surely, 2^21416136243 is an apocalyptic number.

21416136243 is a deficient number, since it is larger than the sum of its proper divisors (7312938957).

21416136243 is a wasteful number, since it uses less digits than its factorization.

21416136243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63562.

The product of its digits is 20736, while the sum is 33.

Adding to 21416136243 its reverse (34263161412), we get a palindrome (55679297655).

The spelling of 21416136243 in words is "twenty-one billion, four hundred sixteen million, one hundred thirty-six thousand, two hundred forty-three".