21463425 has 18 divisors (see below), whose sum is σ = 38443782. Its totient is φ = 11447040.

The previous prime is 21463423. The next prime is 21463427. The reversal of 21463425 is 52436412.

21463425 is a `hidden beast` number, since 2 + 1 + 4 + 634 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (21463423) and next prime (21463427).

It can be written as a sum of positive squares in 3 ways, for example, as 6230016 + 15233409 = 2496^2 + 3903^2 .

It is not a de Polignac number, because 21463425 - 2¹ = 21463423 is a prime.

It is a super-2 number, since 2×21463425² = 921357225461250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21463423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47472 + ... + 47921.

Almost surely, 2^21463425 is an apocalyptic number.

21463425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21463425 is a deficient number, since it is larger than the sum of its proper divisors (16980357).

21463425 is a wasteful number, since it uses less digits than its factorization.

21463425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95409 (or 95401 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21463425 is about 4632.8635853001. The cubic root of 21463425 is about 277.9071209491.

Adding to 21463425 its reverse (52436412), we get a palindrome (73899837).

The spelling of 21463425 in words is "twenty-one million, four hundred sixty-three thousand, four hundred twenty-five".