21140029 has 8 divisors (see below), whose sum is σ = 21490560. Its totient is φ = 20792496.

The previous prime is 21140011. The next prime is 21140033. The reversal of 21140029 is 92004112.

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 21140029 - 2⁷ = 21139901 is a prime.

It is a super-2 number, since 2×21140029² = 893801652241682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21139988 and 21140015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140069) 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 7 ways as a sum of consecutive naturals, for example, 16587 + ... + 17815.

It is an arithmetic number, because the mean of its divisors is an integer number (2686320).

Almost surely, 2^21140029 is an apocalyptic number.

21140029 is the 2458-th nonagonal number.

It is an amenable number.

21140029 is a deficient number, since it is larger than the sum of its proper divisors (350531).

21140029 is a wasteful number, since it uses less digits than its factorization.

21140029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21140029 is about 4597.8287266926. The cubic root of 21140029 is about 276.5042809283.

The spelling of 21140029 in words is "twenty-one million, one hundred forty thousand, twenty-nine".