21346771570 has 16 divisors (see below), whose sum is σ = 38820316248. Its totient is φ = 8450680320.

The previous prime is 21346771549. The next prime is 21346771573. The reversal of 21346771570 is 7517764312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18255522769 + 3091248801 = 135113^2 + 55599^2 .

It is not an unprimeable number, because it can be changed into a prime (21346771573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11002521 + ... + 11004460.

Almost surely, 2^21346771570 is an apocalyptic number.

21346771570 is a deficient number, since it is larger than the sum of its proper divisors (17473544678).

21346771570 is a wasteful number, since it uses less digits than its factorization.

21346771570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22007085.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 21346771570 in words is "twenty-one billion, three hundred forty-six million, seven hundred seventy-one thousand, five hundred seventy".