21010329 has 12 divisors (see below), whose sum is σ = 30802096. Its totient is φ = 13797432.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010329 is 92301012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010321) and next prime (21010337).

It is not a de Polignac number, because 21010329 - 2³ = 21010321 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16819 + ... + 18024.

Almost surely, 2^21010329 is an apocalyptic number.

It is an amenable number.

21010329 is a deficient number, since it is larger than the sum of its proper divisors (9791767).

21010329 is a wasteful number, since it uses less digits than its factorization.

21010329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34916 (or 34913 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21010329 is about 4583.7025427050. The cubic root of 21010329 is about 275.9376434428.

It can be divided in two parts, 2 and 1010329, that added together give a triangular number (1010331 = T₁₄₂₁).

The spelling of 21010329 in words is "twenty-one million, ten thousand, three hundred twenty-nine".