21012232413 has 4 divisors (see below), whose sum is σ = 28016309888. Its totient is φ = 14008154940.

The previous prime is 21012232391. The next prime is 21012232433. The reversal of 21012232413 is 31423221012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21012232413 - 2⁶ = 21012232349 is a prime.

It is a super-3 number, since 3×21012232413³ (a number of 32 digits) contains 333 as substring.

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 21012232413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012232433) 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 3 ways as a sum of consecutive naturals, for example, 3502038733 + ... + 3502038738.

It is an arithmetic number, because the mean of its divisors is an integer number (7004077472).

Almost surely, 2^21012232413 is an apocalyptic number.

It is an amenable number.

21012232413 is a deficient number, since it is larger than the sum of its proper divisors (7004077475).

21012232413 is an equidigital number, since it uses as much as digits as its factorization.

21012232413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004077474.

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

Adding to 21012232413 its reverse (31423221012), we get a palindrome (52435453425).

The spelling of 21012232413 in words is "twenty-one billion, twelve million, two hundred thirty-two thousand, four hundred thirteen".