21463420 has 24 divisors (see below), whose sum is σ = 49171248. Its totient is φ = 7804800.

The previous prime is 21463417. The next prime is 21463423. The reversal of 21463420 is 2436412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21463417) and next prime (21463423).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21463391 and 21463400.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 48561 + ... + 49000.

It is an arithmetic number, because the mean of its divisors is an integer number (2048802).

Almost surely, 2^21463420 is an apocalyptic number.

21463420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21463420 is an abundant number, since it is smaller than the sum of its proper divisors (27707828).

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

21463420 is a wasteful number, since it uses less digits than its factorization.

21463420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97581 (or 97579 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21463420 is about 4632.8630456770. The cubic root of 21463420 is about 277.9070993692.

Adding to 21463420 its reverse (2436412), we get a palindrome (23899832).

The spelling of 21463420 in words is "twenty-one million, four hundred sixty-three thousand, four hundred twenty".