21954941 has 2 divisors, whose sum is σ = 21954942. Its totient is φ = 21954940.

The previous prime is 21954929. The next prime is 21954953. The reversal of 21954941 is 14945912.

It is a balanced prime because it is at equal distance from previous prime (21954929) and next prime (21954953).

It can be written as a sum of positive squares in only one way, i.e., 20894041 + 1060900 = 4571^2 + 1030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21954941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21954901) 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, 10977470 + 10977471.

It is an arithmetic number, because the mean of its divisors is an integer number (10977471).

Almost surely, 2^21954941 is an apocalyptic number.

It is an amenable number.

21954941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954941 is an equidigital number, since it uses as much as digits as its factorization.

21954941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 21954941 is about 4685.6099923062. The cubic root of 21954941 is about 280.0125036933.

The spelling of 21954941 in words is "twenty-one million, nine hundred fifty-four thousand, nine hundred forty-one".