21485153 has 2 divisors, whose sum is σ = 21485154. Its totient is φ = 21485152.

The previous prime is 21485147. The next prime is 21485171. The reversal of 21485153 is 35158412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 7772944 = 3703^2 + 2788^2 .

It is a cyclic number.

It is not a de Polignac number, because 21485153 - 2⁶ = 21485089 is a prime.

It is a super-2 number, since 2×21485153² = 923223598866818, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21485053) 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 as a sum of consecutive naturals, namely, 10742576 + 10742577.

It is an arithmetic number, because the mean of its divisors is an integer number (10742577).

Almost surely, 2^21485153 is an apocalyptic number.

It is an amenable number.

21485153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485153 is an equidigital number, since it uses as much as digits as its factorization.

21485153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 21485153 is about 4635.2079780739. The cubic root of 21485153 is about 278.0008669296. Note that the first 3 decimals are identical.

The spelling of 21485153 in words is "twenty-one million, four hundred eighty-five thousand, one hundred fifty-three".