21029372159 has 4 divisors (see below), whose sum is σ = 22136181240. Its totient is φ = 19922563080.

The previous prime is 21029372149. The next prime is 21029372201. The reversal of 21029372159 is 95127392012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21029372159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029372129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553404512 + ... + 553404549.

It is an arithmetic number, because the mean of its divisors is an integer number (5534045310).

Almost surely, 2^21029372159 is an apocalyptic number.

21029372159 is a deficient number, since it is larger than the sum of its proper divisors (1106809081).

21029372159 is a wasteful number, since it uses less digits than its factorization.

21029372159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106809080.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 21029372159 in words is "twenty-one billion, twenty-nine million, three hundred seventy-two thousand, one hundred fifty-nine".