21953042 has 12 divisors (see below), whose sum is σ = 33651870. Its totient is φ = 10740816.

The previous prime is 21953033. The next prime is 21953051. The reversal of 21953042 is 24035912.

It is an interprime number because it is at equal distance from previous prime (21953033) and next prime (21953051).

It can be written as a sum of positive squares in only one way, i.e., 20784481 + 1168561 = 4559^2 + 1081^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1934 + ... + 6902.

Almost surely, 2^21953042 is an apocalyptic number.

21953042 is a deficient number, since it is larger than the sum of its proper divisors (11698828).

21953042 is an equidigital number, since it uses as much as digits as its factorization.

21953042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065 (or 5018 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21953042 is about 4685.4073462187. The cubic root of 21953042 is about 280.0044302020.

Adding to 21953042 its reverse (24035912), we get a palindrome (45988954).

The spelling of 21953042 in words is "twenty-one million, nine hundred fifty-three thousand, forty-two".