21164307530 has 8 divisors (see below), whose sum is σ = 38095753572. Its totient is φ = 8465723008.

The previous prime is 21164307491. The next prime is 21164307547. The reversal of 21164307530 is 3570346112.

It can be written as a sum of positive squares in 2 ways, for example, as 18919727401 + 2244580129 = 137549^2 + 47377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21164307530³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058215367 + ... + 1058215386.

Almost surely, 2^21164307530 is an apocalyptic number.

21164307530 is a deficient number, since it is larger than the sum of its proper divisors (16931446042).

21164307530 is a wasteful number, since it uses less digits than its factorization.

21164307530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116430760.

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

The spelling of 21164307530 in words is "twenty-one billion, one hundred sixty-four million, three hundred seven thousand, five hundred thirty".