21341430 has 48 divisors (see below), whose sum is σ = 60534864. Its totient is φ = 5173440.

The previous prime is 21341407. The next prime is 21341479. The reversal of 21341430 is 3414312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9789 + ... + 11768.

It is an arithmetic number, because the mean of its divisors is an integer number (1261143).

Almost surely, 2^21341430 is an apocalyptic number.

21341430 is an abundant number, since it is smaller than the sum of its proper divisors (39193434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21341430 is a wasteful number, since it uses less digits than its factorization.

21341430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21581 (or 21578 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21341430 is about 4619.6785602464. The cubic root of 21341430 is about 277.3795922718.

Adding to 21341430 its reverse (3414312), we get a palindrome (24755742).

It can be divided in two parts, 213414 and 30, that added together give a square (213444 = 462²).

The spelling of 21341430 in words is "twenty-one million, three hundred forty-one thousand, four hundred thirty".