21403232013 has 4 divisors (see below), whose sum is σ = 28537642688. Its totient is φ = 14268821340.

The previous prime is 21403232003. The next prime is 21403232023. The reversal of 21403232013 is 31023230412.

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 an interprime number because it is at equal distance from previous prime (21403232003) and next prime (21403232023).

It is not a de Polignac number, because 21403232013 - 2⁸ = 21403231757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403232003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3567205333 + ... + 3567205338.

It is an arithmetic number, because the mean of its divisors is an integer number (7134410672).

Almost surely, 2^21403232013 is an apocalyptic number.

It is an amenable number.

21403232013 is a deficient number, since it is larger than the sum of its proper divisors (7134410675).

21403232013 is an equidigital number, since it uses as much as digits as its factorization.

21403232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134410674.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21403232013 its reverse (31023230412), we get a palindrome (52426462425).

The spelling of 21403232013 in words is "twenty-one billion, four hundred three million, two hundred thirty-two thousand, thirteen".