21232454 has 8 divisors (see below), whose sum is σ = 32589480. Its totient is φ = 10369296.

The previous prime is 21232451. The next prime is 21232457. The reversal of 21232454 is 45423212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21232451) and next prime (21232457).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232451) 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, 123359 + ... + 123530.

It is an arithmetic number, because the mean of its divisors is an integer number (4073685).

Almost surely, 2^21232454 is an apocalyptic number.

21232454 is a deficient number, since it is larger than the sum of its proper divisors (11357026).

21232454 is a wasteful number, since it uses less digits than its factorization.

21232454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246934.

The product of its digits is 1920, while the sum is 23.

The square root of 21232454 is about 4607.8687047267. The cubic root of 21232454 is about 276.9066574587.

Adding to 21232454 its reverse (45423212), we get a palindrome (66655666).

The spelling of 21232454 in words is "twenty-one million, two hundred thirty-two thousand, four hundred fifty-four".