21150045 has 32 divisors (see below), whose sum is σ = 42973440. Its totient is φ = 9668160.

The previous prime is 21150043. The next prime is 21150061. The reversal of 21150045 is 54005112.

It is not a de Polignac number, because 21150045 - 2¹ = 21150043 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150043) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 10246 + ... + 12135.

It is an arithmetic number, because the mean of its divisors is an integer number (1342920).

Almost surely, 2^21150045 is an apocalyptic number.

It is an amenable number.

21150045 is an abundant number, since it is smaller than the sum of its proper divisors (21823395).

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

21150045 is a wasteful number, since it uses less digits than its factorization.

21150045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22402 (or 22396 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21150045 is about 4598.9178074847. The cubic root of 21150045 is about 276.5479426408.

Adding to 21150045 its reverse (54005112), we get a palindrome (75155157).

The spelling of 21150045 in words is "twenty-one million, one hundred fifty thousand, forty-five".