21601029 has 4 divisors (see below), whose sum is σ = 28801376. Its totient is φ = 14400684.

The previous prime is 21600991. The next prime is 21601061. The reversal of 21601029 is 92010612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21601029 - 2²¹ = 19503877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21600996 and 21601014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600169 + ... + 3600174.

It is an arithmetic number, because the mean of its divisors is an integer number (7200344).

Almost surely, 2^21601029 is an apocalyptic number.

It is an amenable number.

21601029 is a deficient number, since it is larger than the sum of its proper divisors (7200347).

21601029 is an equidigital number, since it uses as much as digits as its factorization.

21601029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200346.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21601029 is about 4647.6907169045. The cubic root of 21601029 is about 278.4997523492.

The spelling of 21601029 in words is "twenty-one million, six hundred one thousand, twenty-nine".