21202929 has 24 divisors (see below), whose sum is σ = 33968064. Its totient is φ = 12636000.

The previous prime is 21202919. The next prime is 21202957. The reversal of 21202929 is 92920212.

It is not a de Polignac number, because 21202929 - 2¹⁶ = 21137393 is a prime.

It is a super-3 number, since 3×21202929³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21202919) 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 23 ways as a sum of consecutive naturals, for example, 4284 + ... + 7794.

It is an arithmetic number, because the mean of its divisors is an integer number (1415336).

Almost surely, 2^21202929 is an apocalyptic number.

It is an amenable number.

21202929 is a deficient number, since it is larger than the sum of its proper divisors (12765135).

21202929 is a wasteful number, since it uses less digits than its factorization.

21202929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589 (or 3586 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21202929 is about 4604.6638313779. The cubic root of 21202929 is about 276.7782461506.

The spelling of 21202929 in words is "twenty-one million, two hundred two thousand, nine hundred twenty-nine".