21463146 has 24 divisors (see below), whose sum is σ = 49239684. Its totient is φ = 6733440.

The previous prime is 21463133. The next prime is 21463147. The reversal of 21463146 is 64136412.

21463146 is a `hidden beast` number, since 21 + 4 + 631 + 4 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20115225 + 1347921 = 4485^2 + 1161^2 .

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 11 ways as a sum of consecutive naturals, for example, 34765 + ... + 35376.

Almost surely, 2^21463146 is an apocalyptic number.

21463146 is an abundant number, since it is smaller than the sum of its proper divisors (27776538).

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

21463146 is a wasteful number, since it uses less digits than its factorization.

21463146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70166 (or 70163 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21463146 is about 4632.8334742358. The cubic root of 21463146 is about 277.9059167855.

Adding to 21463146 its reverse (64136412), we get a palindrome (85599558).

It can be divided in two parts, 21463 and 146, that added together give a square (21609 = 147²).

The spelling of 21463146 in words is "twenty-one million, four hundred sixty-three thousand, one hundred forty-six".