21354452 has 12 divisors (see below), whose sum is σ = 42708960. Its totient is φ = 9151896.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354452 is 25445312.

It is a happy number.

21354452 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354451) 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, 381302 + ... + 381357.

It is an arithmetic number, because the mean of its divisors is an integer number (3559080).

Almost surely, 2^21354452 is an apocalyptic number.

It is an amenable number.

21354452 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.

21354452 is a wasteful number, since it uses less digits than its factorization.

21354452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762670 (or 762668 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 21354452 is about 4621.0877507358. The cubic root of 21354452 is about 277.4359974681.

Adding to 21354452 its reverse (25445312), we get a palindrome (46799764).

The spelling of 21354452 in words is "twenty-one million, three hundred fifty-four thousand, four hundred fifty-two".