21063045 has 16 divisors (see below), whose sum is σ = 34036992. Its totient is φ = 11121600.

The previous prime is 21063041. The next prime is 21063047. The reversal of 21063045 is 54036012.

It is a happy number.

It is not a de Polignac number, because 21063045 - 2² = 21063041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5437 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (2127312).

Almost surely, 2^21063045 is an apocalyptic number.

It is an amenable number.

21063045 is a deficient number, since it is larger than the sum of its proper divisors (12973947).

21063045 is a wasteful number, since it uses less digits than its factorization.

21063045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14012.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21063045 is about 4589.4493133708. The cubic root of 21063045 is about 276.1682312950.

Adding to 21063045 its reverse (54036012), we get a palindrome (75099057).

It can be divided in two parts, 2106 and 3045, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 21063045 in words is "twenty-one million, sixty-three thousand, forty-five".