21234136246 has 16 divisors (see below), whose sum is σ = 34509104784. Its totient is φ = 9760149504.

The previous prime is 21234136243. The next prime is 21234136271. The reversal of 21234136246 is 64263143212.

It is a super-2 number, since 2×21234136246² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234136243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7260555 + ... + 7263478.

It is an arithmetic number, because the mean of its divisors is an integer number (2156819049).

Almost surely, 2^21234136246 is an apocalyptic number.

21234136246 is a deficient number, since it is larger than the sum of its proper divisors (13274968538).

21234136246 is a wasteful number, since it uses less digits than its factorization.

21234136246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14524095.

The product of its digits is 41472, while the sum is 34.

Adding to 21234136246 its reverse (64263143212), we get a palindrome (85497279458).

The spelling of 21234136246 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-six thousand, two hundred forty-six".