21214049 has 2 divisors, whose sum is σ = 21214050. Its totient is φ = 21214048.

The previous prime is 21214021. The next prime is 21214087. The reversal of 21214049 is 94041212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 7524049 = 3700^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214049 - 2²⁰ = 20165473 is a prime.

It is not a weakly prime, because it can be changed into another prime (21214549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607024 + 10607025.

It is an arithmetic number, because the mean of its divisors is an integer number (10607025).

Almost surely, 2^21214049 is an apocalyptic number.

It is an amenable number.

21214049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214049 is an equidigital number, since it uses as much as digits as its factorization.

21214049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21214049 is about 4605.8711445285. The cubic root of 21214049 is about 276.8266236838.

The spelling of 21214049 in words is "twenty-one million, two hundred fourteen thousand, forty-nine".