21142153 has 2 divisors, whose sum is σ = 21142154. Its totient is φ = 21142152.

The previous prime is 21142141. The next prime is 21142171. The reversal of 21142153 is 35124112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15586704 + 5555449 = 3948^2 + 2357^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142153 - 2⁹ = 21141641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21142153.

It is not a weakly prime, because it can be changed into another prime (21142123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571076 + 10571077.

It is an arithmetic number, because the mean of its divisors is an integer number (10571077).

Almost surely, 2^21142153 is an apocalyptic number.

It is an amenable number.

21142153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142153 is an equidigital number, since it uses as much as digits as its factorization.

21142153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 21142153 is about 4598.0596994819. The cubic root of 21142153 is about 276.5135410137.

Adding to 21142153 its reverse (35124112), we get a palindrome (56266265).

The spelling of 21142153 in words is "twenty-one million, one hundred forty-two thousand, one hundred fifty-three".