131002021221 has 16 divisors (see below), whose sum is σ = 176028754944. Its totient is φ = 86655596544.

The previous prime is 131002021211. The next prime is 131002021307. The reversal of 131002021221 is 122120200131.

It is not a de Polignac number, because 131002021221 - 2⁷ = 131002021093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131002021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131002021211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 793020 + ... + 943866.

It is an arithmetic number, because the mean of its divisors is an integer number (11001797184).

Almost surely, 2^131002021221 is an apocalyptic number.

It is an amenable number.

131002021221 is a deficient number, since it is larger than the sum of its proper divisors (45026733723).

131002021221 is a wasteful number, since it uses less digits than its factorization.

131002021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153100.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 131002021221 its reverse (122120200131), we get a palindrome (253122221352).

The spelling of 131002021221 in words is "one hundred thirty-one billion, two million, twenty-one thousand, two hundred twenty-one".