21948941 has 8 divisors (see below), whose sum is σ = 25162944. Its totient is φ = 18754560.

The previous prime is 21948937. The next prime is 21948947. The reversal of 21948941 is 14984912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21948941 - 2² = 21948937 is a prime.

It is a super-2 number, since 2×21948941² = 963512022042962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21948895 and 21948904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948947) 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 in 7 ways as a sum of consecutive naturals, for example, 2420 + ... + 7053.

It is an arithmetic number, because the mean of its divisors is an integer number (3145368).

Almost surely, 2^21948941 is an apocalyptic number.

It is an amenable number.

21948941 is a deficient number, since it is larger than the sum of its proper divisors (3214003).

21948941 is an equidigital number, since it uses as much as digits as its factorization.

21948941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9811.

The product of its digits is 20736, while the sum is 38.

The square root of 21948941 is about 4684.9696904036. The cubic root of 21948941 is about 279.9869934434.

The spelling of 21948941 in words is "twenty-one million, nine hundred forty-eight thousand, nine hundred forty-one".