21010304329 has 18 divisors (see below), whose sum is σ = 25794627354. Its totient is φ = 17060984640.

The previous prime is 21010304323. The next prime is 21010304353. The reversal of 21010304329 is 92340301012.

It can be written as a sum of positive squares in only one way, i.e., 10900404025 + 10109900304 = 104405^2 + 100548^2 .

It is not a de Polignac number, because 21010304329 - 2²⁷ = 20876086601 is a prime.

It is a super-2 number, since 2×21010304329² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010304323) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 576192 + ... + 611569.

It is an arithmetic number, because the mean of its divisors is an integer number (1433034853).

Almost surely, 2^21010304329 is an apocalyptic number.

It is an amenable number.

21010304329 is a deficient number, since it is larger than the sum of its proper divisors (4784323025).

21010304329 is a wasteful number, since it uses less digits than its factorization.

21010304329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187813 (or 1187787 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21010304329 in words is "twenty-one billion, ten million, three hundred four thousand, three hundred twenty-nine".