21755212276 has 36 divisors (see below), whose sum is σ = 44333394336. Its totient is φ = 9313978800.

The previous prime is 21755212231. The next prime is 21755212319. The reversal of 21755212276 is 67221255712.

It is a super-2 number, since 2×21755212276² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133161 + ... + 247471.

It is an arithmetic number, because the mean of its divisors is an integer number (1231483176).

Almost surely, 2^21755212276 is an apocalyptic number.

It is an amenable number.

21755212276 is an abundant number, since it is smaller than the sum of its proper divisors (22578182060).

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

21755212276 is a wasteful number, since it uses less digits than its factorization.

21755212276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115300 (or 115291 counting only the distinct ones).

The product of its digits is 117600, while the sum is 40.

Adding to 21755212276 its reverse (67221255712), we get a palindrome (88976467988).

The spelling of 21755212276 in words is "twenty-one billion, seven hundred fifty-five million, two hundred twelve thousand, two hundred seventy-six".