21436072 has 32 divisors (see below), whose sum is σ = 46137600. Its totient is φ = 9146304.

The previous prime is 21436067. The next prime is 21436087. The reversal of 21436072 is 27063412.

It is a plaindrome in base 11.

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 7 ways as a sum of consecutive naturals, for example, 14353 + ... + 15775.

It is an arithmetic number, because the mean of its divisors is an integer number (1441800).

Almost surely, 2^21436072 is an apocalyptic number.

It is an amenable number.

21436072 is an abundant number, since it is smaller than the sum of its proper divisors (24701528).

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

21436072 is a wasteful number, since it uses less digits than its factorization.

21436072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1701 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21436072 is about 4629.9105822899. The cubic root of 21436072 is about 277.7890157705.

Adding to 21436072 its reverse (27063412), we get a palindrome (48499484).

The spelling of 21436072 in words is "twenty-one million, four hundred thirty-six thousand, seventy-two".