21303129 has 16 divisors (see below), whose sum is σ = 29980800. Its totient is φ = 13428096.

The previous prime is 21303127. The next prime is 21303131. The reversal of 21303129 is 92130312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21303127) and next prime (21303131).

It is not a de Polignac number, because 21303129 - 2¹ = 21303127 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4407 + ... + 7875.

It is an arithmetic number, because the mean of its divisors is an integer number (1873800).

Almost surely, 2^21303129 is an apocalyptic number.

It is an amenable number.

21303129 is a deficient number, since it is larger than the sum of its proper divisors (8677671).

21303129 is a wasteful number, since it uses less digits than its factorization.

21303129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21303129 is about 4615.5312803620. The cubic root of 21303129 is about 277.2135571996.

The spelling of 21303129 in words is "twenty-one million, three hundred three thousand, one hundred twenty-nine".