21411036 has 18 divisors (see below), whose sum is σ = 54122432. Its totient is φ = 7137000.

The previous prime is 21411023. The next prime is 21411059. The reversal of 21411036 is 63011412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 297340 + ... + 297411.

Almost surely, 2^21411036 is an apocalyptic number.

It is an amenable number.

21411036 is an abundant number, since it is smaller than the sum of its proper divisors (32711396).

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

21411036 is a wasteful number, since it uses less digits than its factorization.

21411036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594761 (or 594756 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21411036 is about 4627.2060684608. The cubic root of 21411036 is about 277.6808268710.

Adding to 21411036 its reverse (63011412), we get a palindrome (84422448).

The spelling of 21411036 in words is "twenty-one million, four hundred eleven thousand, thirty-six".