21775264275 has 24 divisors (see below), whose sum is σ = 36163240960. Its totient is φ = 11561387040.

The previous prime is 21775264219. The next prime is 21775264319. The reversal of 21775264275 is 57246257712.

It is a happy number.

It is not a de Polignac number, because 21775264275 - 2²¹ = 21773167123 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 634255 + ... + 667704.

Almost surely, 2^21775264275 is an apocalyptic number.

21775264275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21775264275 is a deficient number, since it is larger than the sum of its proper divisors (14387976685).

21775264275 is a wasteful number, since it uses less digits than its factorization.

21775264275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302195 (or 1302190 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 48.

The spelling of 21775264275 in words is "twenty-one billion, seven hundred seventy-five million, two hundred sixty-four thousand, two hundred seventy-five".