21102026445 has 48 divisors (see below), whose sum is σ = 37953377280. Its totient is φ = 11247937344.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026445 is 54462020112.

21102026445 is a `hidden beast` number, since 2 + 1 + 10 + 2 + 0 + 2 + 644 + 5 = 666.

It is not a de Polignac number, because 21102026445 - 2⁹ = 21102025933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2716507 + ... + 2724263.

It is an arithmetic number, because the mean of its divisors is an integer number (790695360).

Almost surely, 2^21102026445 is an apocalyptic number.

It is an amenable number.

21102026445 is a deficient number, since it is larger than the sum of its proper divisors (16851350835).

21102026445 is an equidigital number, since it uses as much as digits as its factorization.

21102026445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10016 (or 10004 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21102026445 its reverse (54462020112), we get a palindrome (75564046557).

The spelling of 21102026445 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred forty-five".