21436052 has 12 divisors (see below), whose sum is σ = 40923456. Its totient is φ = 9743640.

The previous prime is 21436027. The next prime is 21436067. The reversal of 21436052 is 25063412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243548 + ... + 243635.

It is an arithmetic number, because the mean of its divisors is an integer number (3410288).

Almost surely, 2^21436052 is an apocalyptic number.

21436052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21436052 is a deficient number, since it is larger than the sum of its proper divisors (19487404).

21436052 is a wasteful number, since it uses less digits than its factorization.

21436052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487198 (or 487196 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21436052 is about 4629.9084224205. The cubic root of 21436052 is about 277.7889293775.

Adding to 21436052 its reverse (25063412), we get a palindrome (46499464).

It can be divided in two parts, 214360 and 52, that added together give a palindrome (214412).

The spelling of 21436052 in words is "twenty-one million, four hundred thirty-six thousand, fifty-two".