21403010 has 8 divisors (see below), whose sum is σ = 38525436. Its totient is φ = 8561200.

The previous prime is 21402977. The next prime is 21403013. The reversal of 21403010 is 1030412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19545241 + 1857769 = 4421^2 + 1363^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21402982 and 21403000.

It is not an unprimeable number, because it can be changed into a prime (21403013) 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, 1070141 + ... + 1070160.

Almost surely, 2^21403010 is an apocalyptic number.

21403010 is a deficient number, since it is larger than the sum of its proper divisors (17122426).

21403010 is a wasteful number, since it uses less digits than its factorization.

21403010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140308.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21403010 is about 4626.3387251692. The cubic root of 21403010 is about 277.6461259992.

Adding to 21403010 its reverse (1030412), we get a palindrome (22433422).

The spelling of 21403010 in words is "twenty-one million, four hundred three thousand, ten".