21766011252 has 12 divisors (see below), whose sum is σ = 50787359616. Its totient is φ = 7255337080.

The previous prime is 21766011233. The next prime is 21766011257. The reversal of 21766011252 is 25211066712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21766011257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906917124 + ... + 906917147.

It is an arithmetic number, because the mean of its divisors is an integer number (4232279968).

Almost surely, 2^21766011252 is an apocalyptic number.

It is an amenable number.

21766011252 is an abundant number, since it is smaller than the sum of its proper divisors (29021348364).

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

21766011252 is a wasteful number, since it uses less digits than its factorization.

21766011252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813834278 (or 1813834276 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 21766011252 its reverse (25211066712), we get a palindrome (46977077964).

The spelling of 21766011252 in words is "twenty-one billion, seven hundred sixty-six million, eleven thousand, two hundred fifty-two".