21401230 has 16 divisors (see below), whose sum is σ = 38780064. Its totient is φ = 8503200.

The previous prime is 21401203. The next prime is 21401251. The reversal of 21401230 is 3210412.

It is a self number, because there is not a number n which added to its sum of digits gives 21401230.

It is a congruent 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, 5577 + ... + 8596.

It is an arithmetic number, because the mean of its divisors is an integer number (2423754).

Almost surely, 2^21401230 is an apocalyptic number.

21401230 is a deficient number, since it is larger than the sum of its proper divisors (17378834).

21401230 is a wasteful number, since it uses less digits than its factorization.

21401230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14331.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21401230 is about 4626.1463444210. The cubic root of 21401230 is about 277.6384288917.

Adding to 21401230 its reverse (3210412), we get a palindrome (24611642).

The spelling of 21401230 in words is "twenty-one million, four hundred one thousand, two hundred thirty".