21250006027 has 4 divisors (see below), whose sum is σ = 21506030280. Its totient is φ = 20993981776.

The previous prime is 21250006003. The next prime is 21250006033. The reversal of 21250006027 is 72060005212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21250006027 - 2¹⁹ = 21249481739 is a prime.

It is a super-2 number, since 2×21250006027² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21250005992 and 21250006010.

It is not an unprimeable number, because it can be changed into a prime (21250001027) 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 in 3 ways as a sum of consecutive naturals, for example, 128012002 + ... + 128012167.

It is an arithmetic number, because the mean of its divisors is an integer number (5376507570).

Almost surely, 2^21250006027 is an apocalyptic number.

21250006027 is a deficient number, since it is larger than the sum of its proper divisors (256024253).

21250006027 is an equidigital number, since it uses as much as digits as its factorization.

21250006027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256024252.

The product of its (nonzero) digits is 1680, while the sum is 25.

The spelling of 21250006027 in words is "twenty-one billion, two hundred fifty million, six thousand, twenty-seven".