21113213320 has 32 divisors (see below), whose sum is σ = 47612980800. Its totient is φ = 8426040768.

The previous prime is 21113213243. The next prime is 21113213339. The reversal of 21113213320 is 2331231112.

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, 583614 + ... + 618733.

It is an arithmetic number, because the mean of its divisors is an integer number (1487905650).

Almost surely, 2^21113213320 is an apocalyptic number.

21113213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113213320 is an abundant number, since it is smaller than the sum of its proper divisors (26499767480).

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

21113213320 is a wasteful number, since it uses less digits than its factorization.

21113213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202797 (or 1202793 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21113213320 its reverse (2331231112), we get a palindrome (23444444432).

The spelling of 21113213320 in words is "twenty-one billion, one hundred thirteen million, two hundred thirteen thousand, three hundred twenty".