21164705330 has 32 divisors (see below), whose sum is σ = 39355918848. Its totient is φ = 8186428800.

The previous prime is 21164705329. The next prime is 21164705333. The reversal of 21164705330 is 3350746112.

It is not an unprimeable number, because it can be changed into a prime (21164705333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383669 + ... + 435351.

It is an arithmetic number, because the mean of its divisors is an integer number (1229872464).

Almost surely, 2^21164705330 is an apocalyptic number.

21164705330 is a deficient number, since it is larger than the sum of its proper divisors (18191213518).

21164705330 is a wasteful number, since it uses less digits than its factorization.

21164705330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53042.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21164705330 in words is "twenty-one billion, one hundred sixty-four million, seven hundred five thousand, three hundred thirty".