21403130 has 16 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 7338192.

The previous prime is 21403117. The next prime is 21403159. The reversal of 21403130 is 3130412.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152810 + ... + 152949.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^21403130 is an apocalyptic number.

21403130 is an abundant number, since it is smaller than the sum of its proper divisors (22626310).

21403130 is a wasteful number, since it uses less digits than its factorization.

21403130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305773.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21403130 is about 4626.3516943700. The cubic root of 21403130 is about 277.6466448899.

Adding to 21403130 its reverse (3130412), we get a palindrome (24533542).

The spelling of 21403130 in words is "twenty-one million, four hundred three thousand, one hundred thirty".