21211054752 has 48 divisors (see below), whose sum is σ = 55824491520. Its totient is φ = 7051878912.

The previous prime is 21211054747. The next prime is 21211054783. The reversal of 21211054752 is 25745011212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251677 + ... + 325212.

It is an arithmetic number, because the mean of its divisors is an integer number (1163010240).

Almost surely, 2^21211054752 is an apocalyptic number.

It is an amenable number.

21211054752 is an abundant number, since it is smaller than the sum of its proper divisors (34613436768).

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

21211054752 is a wasteful number, since it uses less digits than its factorization.

21211054752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577285 (or 577277 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

Adding to 21211054752 its reverse (25745011212), we get a palindrome (46956065964).

The spelling of 21211054752 in words is "twenty-one billion, two hundred eleven million, fifty-four thousand, seven hundred fifty-two".