21164124242 has 8 divisors (see below), whose sum is σ = 31787471100. Its totient is φ = 10568300544.

The previous prime is 21164124229. The next prime is 21164124251. The reversal of 21164124242 is 24242146112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21060104641 + 104019601 = 145121^2 + 10199^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6878867 + ... + 6881942.

Almost surely, 2^21164124242 is an apocalyptic number.

21164124242 is a deficient number, since it is larger than the sum of its proper divisors (10623346858).

21164124242 is a wasteful number, since it uses less digits than its factorization.

21164124242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761580.

The product of its digits is 6144, while the sum is 29.

The spelling of 21164124242 in words is "twenty-one billion, one hundred sixty-four million, one hundred twenty-four thousand, two hundred forty-two".