21736136 has 16 divisors (see below), whose sum is σ = 40815600. Its totient is φ = 10851984.

The previous prime is 21736111. The next prime is 21736151. The reversal of 21736136 is 63163712.

It is a junction number, because it is equal to n+sod(n) for n = 21736099 and 21736108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5291 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (2550975).

Almost surely, 2^21736136 is an apocalyptic number.

It is an amenable number.

21736136 is a deficient number, since it is larger than the sum of its proper divisors (19079464).

21736136 is a wasteful number, since it uses less digits than its factorization.

21736136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4024 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 21736136 is about 4662.2029127870. The cubic root of 21736136 is about 279.0791859952.

Adding to 21736136 its reverse (63163712), we get a palindrome (84899848).

It can be divided in two parts, 21736 and 136, that multiplied together give a triangular number (2956096 = T₂₄₃₁).

The spelling of 21736136 in words is "twenty-one million, seven hundred thirty-six thousand, one hundred thirty-six".