21963413 has 8 divisors (see below), whose sum is σ = 23478336. Its totient is φ = 20495200.

The previous prime is 21963379. The next prime is 21963433. The reversal of 21963413 is 31436912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21963413 - 2¹⁰ = 21962389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21963433) 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, 10703 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (2934792).

Almost surely, 2^21963413 is an apocalyptic number.

21963413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21963413 is a deficient number, since it is larger than the sum of its proper divisors (1514923).

21963413 is a wasteful number, since it uses less digits than its factorization.

21963413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23355.

The product of its digits is 3888, while the sum is 29.

The square root of 21963413 is about 4686.5139496218. The cubic root of 21963413 is about 280.0485162529.

The spelling of 21963413 in words is "twenty-one million, nine hundred sixty-three thousand, four hundred thirteen".