131221541078 has 32 divisors (see below), whose sum is σ = 208716963840. Its totient is φ = 61776046080.

The previous prime is 131221541063. The next prime is 131221541089. The reversal of 131221541078 is 870145122131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589403 + ... + 780921.

It is an arithmetic number, because the mean of its divisors is an integer number (6522405120).

Almost surely, 2^131221541078 is an apocalyptic number.

131221541078 is a deficient number, since it is larger than the sum of its proper divisors (77495422762).

131221541078 is a wasteful number, since it uses less digits than its factorization.

131221541078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191852.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 131221541078 in words is "one hundred thirty-one billion, two hundred twenty-one million, five hundred forty-one thousand, seventy-eight".