21404345313 has 16 divisors (see below), whose sum is σ = 30789654336. Its totient is φ = 13148243520.

The previous prime is 21404345299. The next prime is 21404345383. The reversal of 21404345313 is 31354340412.

It is not a de Polignac number, because 21404345313 - 2⁴ = 21404345297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21404345383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470943 + ... + 514388.

It is an arithmetic number, because the mean of its divisors is an integer number (1924353396).

Almost surely, 2^21404345313 is an apocalyptic number.

It is an amenable number.

21404345313 is a deficient number, since it is larger than the sum of its proper divisors (9385309023).

21404345313 is a wasteful number, since it uses less digits than its factorization.

21404345313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985904.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21404345313 its reverse (31354340412), we get a palindrome (52758685725).

The spelling of 21404345313 in words is "twenty-one billion, four hundred four million, three hundred forty-five thousand, three hundred thirteen".