1131313120221 has 32 divisors (see below), whose sum is σ = 1597625948160. Its totient is φ = 710863521984.

The previous prime is 1131313120177. The next prime is 1131313120277. The reversal of 1131313120221 is 1220213131311.

It is not a de Polignac number, because 1131313120221 - 2⁹ = 1131313119709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131313120121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6585400 + ... + 6755006.

It is an arithmetic number, because the mean of its divisors is an integer number (49925810880).

Almost surely, 2^{1131313120221} is an apocalyptic number.

It is an amenable number.

1131313120221 is a deficient number, since it is larger than the sum of its proper divisors (466312827939).

1131313120221 is a wasteful number, since it uses less digits than its factorization.

1131313120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171465.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1131313120221 its reverse (1220213131311), we get a palindrome (2351526251532).

The spelling of 1131313120221 in words is "one trillion, one hundred thirty-one billion, three hundred thirteen million, one hundred twenty thousand, two hundred twenty-one".