21014429 has 2 divisors, whose sum is σ = 21014430. Its totient is φ = 21014428.

The previous prime is 21014407. The next prime is 21014453. The reversal of 21014429 is 92441012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 1416100 = 4427^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014429 - 2²⁰ = 19965853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507214 + 10507215.

It is an arithmetic number, because the mean of its divisors is an integer number (10507215).

Almost surely, 2^21014429 is an apocalyptic number.

It is an amenable number.

21014429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014429 is an equidigital number, since it uses as much as digits as its factorization.

21014429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21014429 is about 4584.1497575886. The cubic root of 21014429 is about 275.9555912937.

The spelling of 21014429 in words is "twenty-one million, fourteen thousand, four hundred twenty-nine".