21203011131200 has 42 divisors (see below), whose sum is σ = 52172659268646. Its totient is φ = 8481204451840.

The previous prime is 21203011131199. The next prime is 21203011131251. The reversal of 21203011131200 is 213111030212.

It can be written as a sum of positive squares in 3 ways, for example, as 3513315379456 + 17689695751744 = 1874384^2 + 4205912^2 .

It is a super-2 number, since 2×21203011131200² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6625939379 + ... + 6625942578.

It is an arithmetic number, because the mean of its divisors is an integer number (1242206173063).

Almost surely, 2^{21203011131200} is an apocalyptic number.

21203011131200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203011131200 is an abundant number, since it is smaller than the sum of its proper divisors (30969648137446).

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

21203011131200 is a wasteful number, since it uses less digits than its factorization.

21203011131200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13251881979 (or 13251881964 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21203011131200 its reverse (213111030212), we get a palindrome (21416122161412).

The spelling of 21203011131200 in words is "twenty-one trillion, two hundred three billion, eleven million, one hundred thirty-one thousand, two hundred".