21431703 has 8 divisors (see below), whose sum is σ = 28720000. Its totient is φ = 14215608.

The previous prime is 21431701. The next prime is 21431717. The reversal of 21431703 is 30713412.

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

It is not a de Polignac number, because 21431703 - 2¹ = 21431701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21431703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431701) 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, 17353 + ... + 18546.

It is an arithmetic number, because the mean of its divisors is an integer number (3590000).

Almost surely, 2^21431703 is an apocalyptic number.

21431703 is a deficient number, since it is larger than the sum of its proper divisors (7288297).

21431703 is a wasteful number, since it uses less digits than its factorization.

21431703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36101.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21431703 is about 4629.4387348792. The cubic root of 21431703 is about 277.7701419353.

The spelling of 21431703 in words is "twenty-one million, four hundred thirty-one thousand, seven hundred three".