21346570 has 32 divisors (see below), whose sum is σ = 44074368. Its totient is φ = 7291968.

The previous prime is 21346547. The next prime is 21346571. The reversal of 21346570 is 7564312.

It is not an unprimeable number, because it can be changed into a prime (21346571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32364 + ... + 33016.

It is an arithmetic number, because the mean of its divisors is an integer number (1377324).

Almost surely, 2^21346570 is an apocalyptic number.

21346570 is an abundant number, since it is smaller than the sum of its proper divisors (22727798).

21346570 is a wasteful number, since it uses less digits than its factorization.

21346570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21346570 is about 4620.2348425161. The cubic root of 21346570 is about 277.4018590812.

The spelling of 21346570 in words is "twenty-one million, three hundred forty-six thousand, five hundred seventy".