21164047242 has 32 divisors (see below), whose sum is σ = 45627163008. Its totient is φ = 6505862976.

The previous prime is 21164047213. The next prime is 21164047309. The reversal of 21164047242 is 24274046112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44713 + ... + 210540.

It is an arithmetic number, because the mean of its divisors is an integer number (1425848844).

Almost surely, 2^21164047242 is an apocalyptic number.

21164047242 is an abundant number, since it is smaller than the sum of its proper divisors (24463115766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21164047242 is a wasteful number, since it uses less digits than its factorization.

21164047242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256334.

The product of its (nonzero) digits is 21504, while the sum is 33.

The spelling of 21164047242 in words is "twenty-one billion, one hundred sixty-four million, forty-seven thousand, two hundred forty-two".