21842948 has 6 divisors (see below), whose sum is σ = 38225166. Its totient is φ = 10921472.

The previous prime is 21842929. The next prime is 21842957. The reversal of 21842948 is 84924812.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 1844164 = 4472^2 + 1358^2 .

It is a super-2 number, since 2×21842948² = 954228754661408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2730365 + ... + 2730372.

It is an arithmetic number, because the mean of its divisors is an integer number (6370861).

Almost surely, 2^21842948 is an apocalyptic number.

It is an amenable number.

21842948 is a deficient number, since it is larger than the sum of its proper divisors (16382218).

21842948 is a wasteful number, since it uses less digits than its factorization.

21842948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460741 (or 5460739 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 21842948 is about 4673.6439744593. The cubic root of 21842948 is about 279.5355736353.

The spelling of 21842948 in words is "twenty-one million, eight hundred forty-two thousand, nine hundred forty-eight".