21012242313 has 8 divisors (see below), whose sum is σ = 28034416000. Its totient is φ = 13999115088.

The previous prime is 21012242287. The next prime is 21012242323. The reversal of 21012242313 is 31324221012.

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

It is not a de Polignac number, because 21012242313 - 2²⁸ = 20743806857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012242313.

It is not an unprimeable number, because it can be changed into a prime (21012242323) 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, 2256193 + ... + 2265486.

It is an arithmetic number, because the mean of its divisors is an integer number (3504302000).

Almost surely, 2^21012242313 is an apocalyptic number.

It is an amenable number.

21012242313 is a deficient number, since it is larger than the sum of its proper divisors (7022173687).

21012242313 is a wasteful number, since it uses less digits than its factorization.

21012242313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523231.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21012242313 its reverse (31324221012), we get a palindrome (52336463325).

The spelling of 21012242313 in words is "twenty-one billion, twelve million, two hundred forty-two thousand, three hundred thirteen".