21252054 has 8 divisors (see below), whose sum is σ = 42504120. Its totient is φ = 7084016.

The previous prime is 21252047. The next prime is 21252059. The reversal of 21252054 is 45025212.

It is a happy number.

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

21252054 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21252054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252059) 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, 1770999 + ... + 1771010.

It is an arithmetic number, because the mean of its divisors is an integer number (5313015).

Almost surely, 2^21252054 is an apocalyptic number.

21252054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21252054 is a wasteful number, since it uses less digits than its factorization.

21252054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3542014.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 21252054 is about 4609.9950108433. The cubic root of 21252054 is about 276.9918368310.

Adding to 21252054 its reverse (45025212), we get a palindrome (66277266).

The spelling of 21252054 in words is "twenty-one million, two hundred fifty-two thousand, fifty-four".