21363099 has 4 divisors (see below), whose sum is σ = 28484136. Its totient is φ = 14242064.

The previous prime is 21363079. The next prime is 21363103. The reversal of 21363099 is 99036312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21363099 - 2⁹ = 21362587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21363029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560514 + ... + 3560519.

It is an arithmetic number, because the mean of its divisors is an integer number (7121034).

Almost surely, 2^21363099 is an apocalyptic number.

21363099 is a deficient number, since it is larger than the sum of its proper divisors (7121037).

21363099 is an equidigital number, since it uses as much as digits as its factorization.

21363099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121036.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 21363099 is about 4622.0232582712. The cubic root of 21363099 is about 277.4734395486.

The spelling of 21363099 in words is "twenty-one million, three hundred sixty-three thousand, ninety-nine".