21131241140 has 48 divisors (see below), whose sum is σ = 45838732800. Its totient is φ = 8174183040.

The previous prime is 21131241119. The next prime is 21131241149. The reversal of 21131241140 is 4114213112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131241149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949379 + ... + 971381.

It is an arithmetic number, because the mean of its divisors is an integer number (954973600).

Almost surely, 2^21131241140 is an apocalyptic number.

21131241140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131241140 is an abundant number, since it is smaller than the sum of its proper divisors (24707491660).

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

21131241140 is a wasteful number, since it uses less digits than its factorization.

21131241140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23592 (or 23590 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21131241140 its reverse (4114213112), we get a palindrome (25245454252).

The spelling of 21131241140 in words is "twenty-one billion, one hundred thirty-one million, two hundred forty-one thousand, one hundred forty".