21452113 has 4 divisors (see below), whose sum is σ = 22714020. Its totient is φ = 20190208.

The previous prime is 21452111. The next prime is 21452131. The reversal of 21452113 is 31125412.

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 18037009 + 3415104 = 4247^2 + 1848^2 .

It is a cyclic number.

It is not a de Polignac number, because 21452113 - 2¹ = 21452111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452111) 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, 630928 + ... + 630961.

It is an arithmetic number, because the mean of its divisors is an integer number (5678505).

Almost surely, 2^21452113 is an apocalyptic number.

It is an amenable number.

21452113 is a deficient number, since it is larger than the sum of its proper divisors (1261907).

21452113 is a wasteful number, since it uses less digits than its factorization.

21452113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261906.

The product of its digits is 240, while the sum is 19.

The square root of 21452113 is about 4631.6425812016. The cubic root of 21452113 is about 277.8582900069.

Adding to 21452113 its reverse (31125412), we get a palindrome (52577525).

The spelling of 21452113 in words is "twenty-one million, four hundred fifty-two thousand, one hundred thirteen".