21310029 has 24 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 12542112.

The previous prime is 21310021. The next prime is 21310043. The reversal of 21310029 is 92001312.

It is a happy number.

It is not a de Polignac number, because 21310029 - 2³ = 21310021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21309993 and 21310020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310021) 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 23 ways as a sum of consecutive naturals, for example, 1269 + ... + 6650.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^21310029 is an apocalyptic number.

It is an amenable number.

21310029 is a deficient number, since it is larger than the sum of its proper divisors (13284531).

21310029 is a wasteful number, since it uses less digits than its factorization.

21310029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961 (or 7958 counting only the distinct ones).

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

The square root of 21310029 is about 4616.2786960928. The cubic root of 21310029 is about 277.2434834305.

The spelling of 21310029 in words is "twenty-one million, three hundred ten thousand, twenty-nine".