21031223013100 has 36 divisors (see below), whose sum is σ = 45666878563264. Its totient is φ = 8407120610880.

The previous prime is 21031223013089. The next prime is 21031223013103. The reversal of 21031223013100 is 131032213012.

It is a super-2 number, since 2×21031223013100² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031223013103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66949947 + ... + 67263346.

Almost surely, 2^{21031223013100} is an apocalyptic number.

21031223013100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031223013100 is an abundant number, since it is smaller than the sum of its proper divisors (24635655550164).

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

21031223013100 is a wasteful number, since it uses less digits than its factorization.

21031223013100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134214874 (or 134214867 counting only the distinct ones).

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

Adding to 21031223013100 its reverse (131032213012), we get a palindrome (21162255226112).

The spelling of 21031223013100 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-three million, thirteen thousand, one hundred".