21190429 has 16 divisors (see below), whose sum is σ = 24038784. Its totient is φ = 18532800.

The previous prime is 21190427. The next prime is 21190441. The reversal of 21190429 is 92409112.

It is a happy number.

It is not a de Polignac number, because 21190429 - 2¹ = 21190427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21190397 and 21190406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38899 + ... + 39439.

It is an arithmetic number, because the mean of its divisors is an integer number (1502424).

Almost surely, 2^21190429 is an apocalyptic number.

It is an amenable number.

21190429 is a deficient number, since it is larger than the sum of its proper divisors (2848355).

21190429 is a wasteful number, since it uses less digits than its factorization.

21190429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21190429 is about 4603.3063117720. The cubic root of 21190429 is about 276.7238447330.

The spelling of 21190429 in words is "twenty-one million, one hundred ninety thousand, four hundred twenty-nine".