21354545413 has 4 divisors (see below), whose sum is σ = 21410890240. Its totient is φ = 21298200588.

The previous prime is 21354545383. The next prime is 21354545419. The reversal of 21354545413 is 31454545312.

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 21354545413 - 2¹³ = 21354537221 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 (21354545419) 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, 28171845 + ... + 28172602.

It is an arithmetic number, because the mean of its divisors is an integer number (5352722560).

Almost surely, 2^21354545413 is an apocalyptic number.

It is an amenable number.

21354545413 is a deficient number, since it is larger than the sum of its proper divisors (56344827).

21354545413 is an equidigital number, since it uses as much as digits as its factorization.

21354545413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56344826.

The product of its digits is 144000, while the sum is 37.

The spelling of 21354545413 in words is "twenty-one billion, three hundred fifty-four million, five hundred forty-five thousand, four hundred thirteen".