21136045 has 16 divisors (see below), whose sum is σ = 29082240. Its totient is φ = 14445504.

The previous prime is 21136039. The next prime is 21136067. The reversal of 21136045 is 54063112.

It is a cyclic number.

It is not a de Polignac number, because 21136045 - 2¹³ = 21127853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12246 + ... + 13864.

It is an arithmetic number, because the mean of its divisors is an integer number (1817640).

Almost surely, 2^21136045 is an apocalyptic number.

It is an amenable number.

21136045 is a deficient number, since it is larger than the sum of its proper divisors (7946195).

21136045 is a wasteful number, since it uses less digits than its factorization.

21136045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004.

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

The square root of 21136045 is about 4597.3954583003. The cubic root of 21136045 is about 276.4869100555.

Adding to 21136045 its reverse (54063112), we get a palindrome (75199157).

The spelling of 21136045 in words is "twenty-one million, one hundred thirty-six thousand, forty-five".