21463145 has 32 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 14826240.

The previous prime is 21463133. The next prime is 21463147. The reversal of 21463145 is 54136412.

It is not a de Polignac number, because 21463145 - 2¹⁶ = 21397609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21463147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107756 + ... + 107954.

It is an arithmetic number, because the mean of its divisors is an integer number (923400).

Almost surely, 2^21463145 is an apocalyptic number.

It is an amenable number.

21463145 is a deficient number, since it is larger than the sum of its proper divisors (8085655).

21463145 is a wasteful number, since it uses less digits than its factorization.

21463145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 2880, while the sum is 26.

The square root of 21463145 is about 4632.8333663105. The cubic root of 21463145 is about 277.9059124695.

Adding to 21463145 its reverse (54136412), we get a palindrome (75599557).

The spelling of 21463145 in words is "twenty-one million, four hundred sixty-three thousand, one hundred forty-five".