21023102413 has 4 divisors (see below), whose sum is σ = 21937150368. Its totient is φ = 20109054460.

The previous prime is 21023102407. The next prime is 21023102431. The reversal of 21023102413 is 31420132012.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 21023102413 - 2⁵ = 21023102381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023102213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457023943 + ... + 457023988.

It is an arithmetic number, because the mean of its divisors is an integer number (5484287592).

Almost surely, 2^21023102413 is an apocalyptic number.

21023102413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21023102413 is a deficient number, since it is larger than the sum of its proper divisors (914047955).

21023102413 is an equidigital number, since it uses as much as digits as its factorization.

21023102413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914047954.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023102413 its reverse (31420132012), we get a palindrome (52443234425).

The spelling of 21023102413 in words is "twenty-one billion, twenty-three million, one hundred two thousand, four hundred thirteen".