21145452 has 24 divisors (see below), whose sum is σ = 49437696. Its totient is φ = 7034448.

The previous prime is 21145451. The next prime is 21145469. The reversal of 21145452 is 25454112.

It is not an unprimeable number, because it can be changed into a prime (21145451) 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, 5833 + ... + 8735.

It is an arithmetic number, because the mean of its divisors is an integer number (2059904).

Almost surely, 2^21145452 is an apocalyptic number.

It is an amenable number.

21145452 is an abundant number, since it is smaller than the sum of its proper divisors (28292244).

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

21145452 is a wasteful number, since it uses less digits than its factorization.

21145452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517 (or 3515 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 21145452 is about 4598.4184237627. The cubic root of 21145452 is about 276.5279225627.

Adding to 21145452 its reverse (25454112), we get a palindrome (46599564).

The spelling of 21145452 in words is "twenty-one million, one hundred forty-five thousand, four hundred fifty-two".