21778026075 has 36 divisors (see below), whose sum is σ = 42007398160. Its totient is φ = 10721488320.

The previous prime is 21778026071. The next prime is 21778026091. The reversal of 21778026075 is 57062087712.

It is not a de Polignac number, because 21778026075 - 2² = 21778026071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21778026075.

It is not an unprimeable number, because it can be changed into a prime (21778026071) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3719815 + ... + 3725664.

Almost surely, 2^21778026075 is an apocalyptic number.

21778026075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21778026075 is a deficient number, since it is larger than the sum of its proper divisors (20229372085).

21778026075 is a wasteful number, since it uses less digits than its factorization.

21778026075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7445508 (or 7445500 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 21778026075 in words is "twenty-one billion, seven hundred seventy-eight million, twenty-six thousand, seventy-five".