21872527 has 2 divisors, whose sum is σ = 21872528. Its totient is φ = 21872526.

The previous prime is 21872519. The next prime is 21872537. The reversal of 21872527 is 72527812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21872527 - 2³ = 21872519 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21872492 and 21872501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21872507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936263 + 10936264.

It is an arithmetic number, because the mean of its divisors is an integer number (10936264).

Almost surely, 2^21872527 is an apocalyptic number.

21872527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21872527 is an equidigital number, since it uses as much as digits as its factorization.

21872527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 34.

The square root of 21872527 is about 4676.8073511745. The cubic root of 21872527 is about 279.6616960079.

The spelling of 21872527 in words is "twenty-one million, eight hundred seventy-two thousand, five hundred twenty-seven".