131211240221020 has 24 divisors (see below), whose sum is σ = 280213835050800. Its totient is φ = 51594928357632.

The previous prime is 131211240221003. The next prime is 131211240221023. The reversal of 131211240221020 is 20122042112131.

It is a junction number, because it is equal to n+sod(n) for n = 131211240220982 and 131211240221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211240221023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55597981965 + ... + 55597984324.

It is an arithmetic number, because the mean of its divisors is an integer number (11675576460450).

Almost surely, 2^{131211240221020} is an apocalyptic number.

131211240221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131211240221020 is an abundant number, since it is smaller than the sum of its proper divisors (149002594829780).

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

131211240221020 is a wasteful number, since it uses less digits than its factorization.

131211240221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111195966357 (or 111195966355 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 131211240221020 its reverse (20122042112131), we get a palindrome (151333282333151).

The spelling of 131211240221020 in words is "one hundred thirty-one trillion, two hundred eleven billion, two hundred forty million, two hundred twenty-one thousand, twenty".