21101311320 has 32 divisors (see below), whose sum is σ = 63303934320. Its totient is φ = 5627016320.

The previous prime is 21101311313. The next prime is 21101311331. The reversal of 21101311320 is 2311310112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21101311320.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 87922011 + ... + 87922250.

Almost surely, 2^21101311320 is an apocalyptic number.

21101311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101311320 is an abundant number, since it is smaller than the sum of its proper divisors (42202623000).

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

21101311320 is a wasteful number, since it uses less digits than its factorization.

21101311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175844275 (or 175844271 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21101311320 its reverse (2311310112), we get a palindrome (23412621432).

The spelling of 21101311320 in words is "twenty-one billion, one hundred one million, three hundred eleven thousand, three hundred twenty".