21150949 has 2 divisors, whose sum is σ = 21150950. Its totient is φ = 21150948.

The previous prime is 21150937. The next prime is 21150967. The reversal of 21150949 is 94905112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 2617924 = 4305^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150949 - 2⁵ = 21150917 is a prime.

It is a super-3 number, since 3×21150949³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21150949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150979) 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, 10575474 + 10575475.

It is an arithmetic number, because the mean of its divisors is an integer number (10575475).

Almost surely, 2^21150949 is an apocalyptic number.

It is an amenable number.

21150949 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150949 is an equidigital number, since it uses as much as digits as its factorization.

21150949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 21150949 is about 4599.0160904263. The cubic root of 21150949 is about 276.5518826762.

The spelling of 21150949 in words is "twenty-one million, one hundred fifty thousand, nine hundred forty-nine".