21453052 has 24 divisors (see below), whose sum is σ = 39670400. Its totient is φ = 10123056.

The previous prime is 21453037. The next prime is 21453059. The reversal of 21453052 is 25035412.

It is a super-2 number, since 2×21453052² = 920466880229408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453059) 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, 33043 + ... + 33685.

Almost surely, 2^21453052 is an apocalyptic number.

It is an amenable number.

21453052 is a deficient number, since it is larger than the sum of its proper divisors (18217348).

21453052 is a wasteful number, since it uses less digits than its factorization.

21453052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21453052 is about 4631.7439480179. The cubic root of 21453052 is about 277.8623440773.

Adding to 21453052 its reverse (25035412), we get a palindrome (46488464).

The spelling of 21453052 in words is "twenty-one million, four hundred fifty-three thousand, fifty-two".