21703401 has 6 divisors (see below), whose sum is σ = 31349370. Its totient is φ = 14468928.

The previous prime is 21703399. The next prime is 21703417. The reversal of 21703401 is 10430712.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 3861225 = 4224^2 + 1965^2 .

It is not a de Polignac number, because 21703401 - 2¹ = 21703399 is a prime.

It is a super-2 number, since 2×21703401² = 942075229933602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21703471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1205736 + ... + 1205753.

It is an arithmetic number, because the mean of its divisors is an integer number (5224895).

Almost surely, 2^21703401 is an apocalyptic number.

It is an amenable number.

21703401 is a deficient number, since it is larger than the sum of its proper divisors (9645969).

21703401 is a wasteful number, since it uses less digits than its factorization.

21703401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411495 (or 2411492 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21703401 is about 4658.6909105456. The cubic root of 21703401 is about 278.9390162314.

The spelling of 21703401 in words is "twenty-one million, seven hundred three thousand, four hundred one".