21454425413 has 4 divisors (see below), whose sum is σ = 21455587980. Its totient is φ = 21453262848.

The previous prime is 21454425383. The next prime is 21454425427. The reversal of 21454425413 is 31452445412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14170997764 + 7283427649 = 119042^2 + 85343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21454425413 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 (21454425313) 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, 553148 + ... + 590661.

It is an arithmetic number, because the mean of its divisors is an integer number (5363896995).

Almost surely, 2^21454425413 is an apocalyptic number.

It is an amenable number.

21454425413 is a deficient number, since it is larger than the sum of its proper divisors (1162567).

21454425413 is a wasteful number, since it uses less digits than its factorization.

21454425413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162566.

The product of its digits is 76800, while the sum is 35.

The spelling of 21454425413 in words is "twenty-one billion, four hundred fifty-four million, four hundred twenty-five thousand, four hundred thirteen".