21452351 has 8 divisors (see below), whose sum is σ = 23198400. Its totient is φ = 19760128.

The previous prime is 21452339. The next prime is 21452357. The reversal of 21452351 is 15325412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21452351 - 2¹⁸ = 21190207 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 (21452357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12626 + ... + 14223.

It is an arithmetic number, because the mean of its divisors is an integer number (2899800).

Almost surely, 2^21452351 is an apocalyptic number.

21452351 is a deficient number, since it is larger than the sum of its proper divisors (1746049).

21452351 is a wasteful number, since it uses less digits than its factorization.

21452351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26913.

The product of its digits is 1200, while the sum is 23.

The square root of 21452351 is about 4631.6682739592. The cubic root of 21452351 is about 277.8593175674.

Adding to 21452351 its reverse (15325412), we get a palindrome (36777763).

The spelling of 21452351 in words is "twenty-one million, four hundred fifty-two thousand, three hundred fifty-one".