21885491007 has 24 divisors (see below), whose sum is σ = 32820737040. Its totient is φ = 14573623680.

The previous prime is 21885490967. The next prime is 21885491039. The reversal of 21885491007 is 70019458812.

21885491007 is a `hidden beast` number, since 21 + 88 + 549 + 1 + 0 + 0 + 7 = 666.

It is not a de Polignac number, because 21885491007 - 2²³ = 21877102399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885491057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162969 + ... + 265197.

It is an arithmetic number, because the mean of its divisors is an integer number (1367530710).

Almost surely, 2^21885491007 is an apocalyptic number.

21885491007 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21885491007 is a deficient number, since it is larger than the sum of its proper divisors (10935246033).

21885491007 is an equidigital number, since it uses as much as digits as its factorization.

21885491007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103125 (or 103113 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 21885491007 in words is "twenty-one billion, eight hundred eighty-five million, four hundred ninety-one thousand, seven".