21527101 has 2 divisors, whose sum is σ = 21527102. Its totient is φ = 21527100.

The previous prime is 21527089. The next prime is 21527123. The reversal of 21527101 is 10172512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16818201 + 4708900 = 4101^2 + 2170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21527101 - 2¹⁷ = 21396029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21527131) 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, 10763550 + 10763551.

It is an arithmetic number, because the mean of its divisors is an integer number (10763551).

Almost surely, 2^21527101 is an apocalyptic number.

It is an amenable number.

21527101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21527101 is an equidigital number, since it uses as much as digits as its factorization.

21527101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 21527101 is about 4639.7307033922. The cubic root of 21527101 is about 278.1816739449.

Adding to 21527101 its reverse (10172512), we get a palindrome (31699613).

The spelling of 21527101 in words is "twenty-one million, five hundred twenty-seven thousand, one hundred one".