21175385029 has 8 divisors (see below), whose sum is σ = 21992469120. Its totient is φ = 20373573696.

The previous prime is 21175385027. The next prime is 21175385057. The reversal of 21175385029 is 92058357112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21175385029 - 2¹ = 21175385027 is a prime.

It is a super-2 number, since 2×21175385029² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21175385027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3815364 + ... + 3820909.

It is an arithmetic number, because the mean of its divisors is an integer number (2749058640).

Almost surely, 2^21175385029 is an apocalyptic number.

It is an amenable number.

21175385029 is a deficient number, since it is larger than the sum of its proper divisors (817084091).

21175385029 is an equidigital number, since it uses as much as digits as its factorization.

21175385029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7636379.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 21175385029 in words is "twenty-one billion, one hundred seventy-five million, three hundred eighty-five thousand, twenty-nine".