21526049 has 2 divisors, whose sum is σ = 21526050. Its totient is φ = 21526048.

The previous prime is 21526039. The next prime is 21526061. The reversal of 21526049 is 94062512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 135424 = 4625^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 21526049 - 2⁸ = 21525793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21526039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763024 + 10763025.

It is an arithmetic number, because the mean of its divisors is an integer number (10763025).

Almost surely, 2^21526049 is an apocalyptic number.

It is an amenable number.

21526049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21526049 is an equidigital number, since it uses as much as digits as its factorization.

21526049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21526049 is about 4639.6173333584. The cubic root of 21526049 is about 278.1771424184.

The spelling of 21526049 in words is "twenty-one million, five hundred twenty-six thousand, forty-nine".