21059229 has 8 divisors (see below), whose sum is σ = 28284480. Its totient is φ = 13936736.

The previous prime is 21059221. The next prime is 21059231. The reversal of 21059229 is 92295012.

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

It is not a de Polignac number, because 21059229 - 2³ = 21059221 is a prime.

It is a super-2 number, since 2×21059229² = 886982252148882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21059196 and 21059205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21059221) 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, 25209 + ... + 26030.

It is an arithmetic number, because the mean of its divisors is an integer number (3535560).

Almost surely, 2^21059229 is an apocalyptic number.

It is an amenable number.

21059229 is a deficient number, since it is larger than the sum of its proper divisors (7225251).

21059229 is a wasteful number, since it uses less digits than its factorization.

21059229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51379.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21059229 is about 4589.0335583868. The cubic root of 21059229 is about 276.1515524526.

The spelling of 21059229 in words is "twenty-one million, fifty-nine thousand, two hundred twenty-nine".