131121012 has 24 divisors (see below), whose sum is σ = 333762912. Its totient is φ = 39733600.

The previous prime is 131120989. The next prime is 131121031. The reversal of 131121012 is 210121131.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 496539 + ... + 496802.

It is an arithmetic number, because the mean of its divisors is an integer number (13906788).

Almost surely, 2^131121012 is an apocalyptic number.

131121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131121012 is an abundant number, since it is smaller than the sum of its proper divisors (202641900).

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

131121012 is a wasteful number, since it uses less digits than its factorization.

131121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993359 (or 993357 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 131121012 is about 11450.8083557450. The cubic root of 131121012 is about 508.0316439254.

Adding to 131121012 its reverse (210121131), we get a palindrome (341242143).

The spelling of 131121012 in words is "one hundred thirty-one million, one hundred twenty-one thousand, twelve".