21463161 has 24 divisors (see below), whose sum is σ = 30436224. Its totient is φ = 13446720.

The previous prime is 21463159. The next prime is 21463177. The reversal of 21463161 is 16136412.

It is not a de Polignac number, because 21463161 - 2¹ = 21463159 is a prime.

It is a super-2 number, since 2×21463161² = 921334560223842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21463111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118491 + ... + 118671.

It is an arithmetic number, because the mean of its divisors is an integer number (1268176).

Almost surely, 2^21463161 is an apocalyptic number.

It is an amenable number.

21463161 is a deficient number, since it is larger than the sum of its proper divisors (8973063).

21463161 is a wasteful number, since it uses less digits than its factorization.

21463161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 260 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21463161 is about 4632.8350931152. The cubic root of 21463161 is about 277.9059815258.

Adding to 21463161 its reverse (16136412), we get a palindrome (37599573).

It can be divided in two parts, 21463 and 161, that multiplied together give a palindrome (3455543).

The spelling of 21463161 in words is "twenty-one million, four hundred sixty-three thousand, one hundred sixty-one".