21088029 has 8 divisors (see below), whose sum is σ = 29024512. Its totient is φ = 13605120.

The previous prime is 21088013. The next prime is 21088057. The reversal of 21088029 is 92088012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21088029 - 2⁴ = 21088013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21087987 and 21088005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113284 + ... + 113469.

It is an arithmetic number, because the mean of its divisors is an integer number (3628064).

Almost surely, 2^21088029 is an apocalyptic number.

It is an amenable number.

21088029 is a deficient number, since it is larger than the sum of its proper divisors (7936483).

21088029 is a wasteful number, since it uses less digits than its factorization.

21088029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226787.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 21088029 is about 4592.1704018906. The cubic root of 21088029 is about 276.2773807685.

The spelling of 21088029 in words is "twenty-one million, eighty-eight thousand, twenty-nine".