21079153 has 2 divisors, whose sum is σ = 21079154. Its totient is φ = 21079152.

The previous prime is 21079141. The next prime is 21079169. The reversal of 21079153 is 35197012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15547249 + 5531904 = 3943^2 + 2352^2 .

It is a cyclic number.

It is not a de Polignac number, because 21079153 - 2²¹ = 18982001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21074153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539576 + 10539577.

It is an arithmetic number, because the mean of its divisors is an integer number (10539577).

Almost surely, 2^21079153 is an apocalyptic number.

It is an amenable number.

21079153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21079153 is an equidigital number, since it uses as much as digits as its factorization.

21079153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 21079153 is about 4591.2038726243. The cubic root of 21079153 is about 276.2386134002.

The spelling of 21079153 in words is "twenty-one million, seventy-nine thousand, one hundred fifty-three".