21011452 has 24 divisors (see below), whose sum is σ = 45843840. Its totient is φ = 8186160.

The previous prime is 21011447. The next prime is 21011453. The reversal of 21011452 is 25411012.

It is a super-2 number, since 2×21011452² = 882962230296608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33802 + ... + 34417.

It is an arithmetic number, because the mean of its divisors is an integer number (1910160).

Almost surely, 2^21011452 is an apocalyptic number.

21011452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011452 is an abundant number, since it is smaller than the sum of its proper divisors (24832388).

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

21011452 is a wasteful number, since it uses less digits than its factorization.

21011452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68241 (or 68239 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21011452 is about 4583.8250402911. The cubic root of 21011452 is about 275.9425596351.

Adding to 21011452 its reverse (25411012), we get a palindrome (46422464).

It can be divided in two parts, 2101 and 1452, that added together give a palindrome (3553).

The spelling of 21011452 in words is "twenty-one million, eleven thousand, four hundred fifty-two".