21399703 has 8 divisors (see below), whose sum is σ = 23789696. Its totient is φ = 19116000.

The previous prime is 21399701. The next prime is 21399737. The reversal of 21399703 is 30799312.

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 21399703 - 2¹ = 21399701 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 (21399701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26148 + ... + 26953.

It is an arithmetic number, because the mean of its divisors is an integer number (2973712).

Almost surely, 2^21399703 is an apocalyptic number.

21399703 is a deficient number, since it is larger than the sum of its proper divisors (2389993).

21399703 is a wasteful number, since it uses less digits than its factorization.

21399703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53145.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 21399703 is about 4625.9813013025. The cubic root of 21399703 is about 277.6318254711.

The spelling of 21399703 in words is "twenty-one million, three hundred ninety-nine thousand, seven hundred three".