21131352246 has 16 divisors (see below), whose sum is σ = 44487057600. Its totient is φ = 6673058568.

The previous prime is 21131352241. The next prime is 21131352259. The reversal of 21131352246 is 64225313112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131352241) 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, 92681256 + ... + 92681483.

It is an arithmetic number, because the mean of its divisors is an integer number (2780441100).

Almost surely, 2^21131352246 is an apocalyptic number.

21131352246 is an abundant number, since it is smaller than the sum of its proper divisors (23355705354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131352246 is a wasteful number, since it uses less digits than its factorization.

21131352246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185362763.

The product of its digits is 8640, while the sum is 30.

Adding to 21131352246 its reverse (64225313112), we get a palindrome (85356665358).

The spelling of 21131352246 in words is "twenty-one billion, one hundred thirty-one million, three hundred fifty-two thousand, two hundred forty-six".