21770275056 has 40 divisors (see below), whose sum is σ = 56294135040. Its totient is φ = 7249757376.

The previous prime is 21770275039. The next prime is 21770275073. The reversal of 21770275056 is 65057207712.

It is an interprime number because it is at equal distance from previous prime (21770275039) and next prime (21770275073).

It is a junction number, because it is equal to n+sod(n) for n = 21770274999 and 21770275017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168390 + ... + 268133.

It is an arithmetic number, because the mean of its divisors is an integer number (1407353376).

Almost surely, 2^21770275056 is an apocalyptic number.

It is an amenable number.

21770275056 is an abundant number, since it is smaller than the sum of its proper divisors (34523859984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21770275056 is a wasteful number, since it uses less digits than its factorization.

21770275056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437573 (or 437567 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 21770275056 in words is "twenty-one billion, seven hundred seventy million, two hundred seventy-five thousand, fifty-six".