21953741 has 2 divisors, whose sum is σ = 21953742. Its totient is φ = 21953740.

The previous prime is 21953677. The next prime is 21953777. The reversal of 21953741 is 14735912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 7672900 = 3779^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21953741 - 2⁶ = 21953677 is a prime.

It is a Chen prime.

It is equal to p_1386545 and since 21953741 and 1386545 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21953698 and 21953707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21953791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10976870 + 10976871.

It is an arithmetic number, because the mean of its divisors is an integer number (10976871).

Almost surely, 2^21953741 is an apocalyptic number.

It is an amenable number.

21953741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21953741 is an equidigital number, since it uses as much as digits as its factorization.

21953741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 21953741 is about 4685.4819389258. The cubic root of 21953741 is about 280.0074020152.

The spelling of 21953741 in words is "twenty-one million, nine hundred fifty-three thousand, seven hundred forty-one".