21043513363 has 8 divisors (see below), whose sum is σ = 21364002000. Its totient is φ = 20723213280.

The previous prime is 21043513357. The next prime is 21043513399. The reversal of 21043513363 is 36331534012.

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 21043513363 - 2⁵ = 21043513331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043513663) 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, 186513 + ... + 277261.

It is an arithmetic number, because the mean of its divisors is an integer number (2670500250).

Almost surely, 2^21043513363 is an apocalyptic number.

21043513363 is a deficient number, since it is larger than the sum of its proper divisors (320488637).

21043513363 is an equidigital number, since it uses as much as digits as its factorization.

21043513363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94277.

The product of its (nonzero) digits is 19440, while the sum is 31.

The spelling of 21043513363 in words is "twenty-one billion, forty-three million, five hundred thirteen thousand, three hundred sixty-three".