21342953 has 2 divisors, whose sum is σ = 21342954. Its totient is φ = 21342952.

The previous prime is 21342943. The next prime is 21342967. The reversal of 21342953 is 35924312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 8690704 = 3557^2 + 2948^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342953 - 2⁶ = 21342889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342943) 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, 10671476 + 10671477.

It is an arithmetic number, because the mean of its divisors is an integer number (10671477).

Almost surely, 2^21342953 is an apocalyptic number.

It is an amenable number.

21342953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342953 is an equidigital number, since it uses as much as digits as its factorization.

21342953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 21342953 is about 4619.8433956142. The cubic root of 21342953 is about 277.3861903781.

The spelling of 21342953 in words is "twenty-one million, three hundred forty-two thousand, nine hundred fifty-three".