21145036 has 12 divisors (see below), whose sum is σ = 40367880. Its totient is φ = 9611360.

The previous prime is 21145001. The next prime is 21145049. The reversal of 21145036 is 63054112.

It is a super-2 number, since 2×21145036² = 894225094882592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21144998 and 21145016.

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, 240241 + ... + 240328.

It is an arithmetic number, because the mean of its divisors is an integer number (3363990).

Almost surely, 2^21145036 is an apocalyptic number.

It is an amenable number.

21145036 is a deficient number, since it is larger than the sum of its proper divisors (19222844).

21145036 is a wasteful number, since it uses less digits than its factorization.

21145036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480584 (or 480582 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21145036 is about 4598.3731905969. The cubic root of 21145036 is about 276.5261091488.

Adding to 21145036 its reverse (63054112), we get a palindrome (84199148).

The spelling of 21145036 in words is "twenty-one million, one hundred forty-five thousand, thirty-six".