21031313200 has 60 divisors (see below), whose sum is σ = 50655386320. Its totient is φ = 8391271680.

The previous prime is 21031313189. The next prime is 21031313231. The reversal of 21031313200 is 231313012.

It is a super-2 number, since 2×21031313200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92581 + ... + 225019.

Almost surely, 2^21031313200 is an apocalyptic number.

21031313200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031313200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25327693160).

21031313200 is an abundant number, since it is smaller than the sum of its proper divisors (29624073120).

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

21031313200 is a wasteful number, since it uses less digits than its factorization.

21031313200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132854 (or 132843 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031313200 its reverse (231313012), we get a palindrome (21262626212).

The spelling of 21031313200 in words is "twenty-one billion, thirty-one million, three hundred thirteen thousand, two hundred".