21404103433213 has 4 divisors (see below), whose sum is σ = 21410861915520. Its totient is φ = 21397344950908.

The previous prime is 21404103433171. The next prime is 21404103433231. The reversal of 21404103433213 is 31233430140412.

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 21404103433213 - 2²¹ = 21404101336061 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 (21404103431213) 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, 3379236403 + ... + 3379242736.

It is an arithmetic number, because the mean of its divisors is an integer number (5352715478880).

Almost surely, 2^{21404103433213} is an apocalyptic number.

It is an amenable number.

21404103433213 is a deficient number, since it is larger than the sum of its proper divisors (6758482307).

21404103433213 is an equidigital number, since it uses as much as digits as its factorization.

21404103433213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758482306.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21404103433213 its reverse (31233430140412), we get a palindrome (52637533573625).

The spelling of 21404103433213 in words is "twenty-one trillion, four hundred four billion, one hundred three million, four hundred thirty-three thousand, two hundred thirteen".