21093029 has 2 divisors, whose sum is σ = 21093030. Its totient is φ = 21093028.

The previous prime is 21093019. The next prime is 21093041. The reversal of 21093029 is 92039012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 6880129 = 3770^2 + 2623^2 .

It is a cyclic number.

It is not a de Polignac number, because 21093029 - 2⁴ = 21093013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21092989 and 21093007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21093019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10546514 + 10546515.

It is an arithmetic number, because the mean of its divisors is an integer number (10546515).

Almost surely, 2^21093029 is an apocalyptic number.

It is an amenable number.

21093029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21093029 is an equidigital number, since it uses as much as digits as its factorization.

21093029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 21093029 is about 4592.7147745097. The cubic root of 21093029 is about 276.2992142890.

It can be divided in two parts, 210 and 93029, that added together give a palindrome (93239).

The spelling of 21093029 in words is "twenty-one million, ninety-three thousand, twenty-nine".