21355210632 has 64 divisors (see below), whose sum is σ = 61033190400. Its totient is φ = 6099658560.

The previous prime is 21355210627. The next prime is 21355210633. The reversal of 21355210632 is 23601255312.

It is a super-2 number, since 2×21355210632² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21355210632.

It is not an unprimeable number, because it can be changed into a prime (21355210633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 602869 + ... + 637307.

It is an arithmetic number, because the mean of its divisors is an integer number (953643600).

Almost surely, 2^21355210632 is an apocalyptic number.

It is an amenable number.

21355210632 is an abundant number, since it is smaller than the sum of its proper divisors (39677979768).

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

21355210632 is a wasteful number, since it uses less digits than its factorization.

21355210632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38146 (or 38142 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21355210632 its reverse (23601255312), we get a palindrome (44956465944).

The spelling of 21355210632 in words is "twenty-one billion, three hundred fifty-five million, two hundred ten thousand, six hundred thirty-two".