21956741 has 8 divisors (see below), whose sum is σ = 24050520. Its totient is φ = 19952128.

The previous prime is 21956731. The next prime is 21956777. The reversal of 21956741 is 14765912.

It can be written as a sum of positive squares in 4 ways, for example, as 14032516 + 7924225 = 3746^2 + 2815^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21956741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21776 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (3006315).

Almost surely, 2^21956741 is an apocalyptic number.

It is an amenable number.

21956741 is a deficient number, since it is larger than the sum of its proper divisors (2093779).

21956741 is a wasteful number, since it uses less digits than its factorization.

21956741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44583.

The product of its digits is 15120, while the sum is 35.

The square root of 21956741 is about 4685.8020658154. The cubic root of 21956741 is about 280.0201558620.

The spelling of 21956741 in words is "twenty-one million, nine hundred fifty-six thousand, seven hundred forty-one".