131221212232021 has 8 divisors (see below), whose sum is σ = 138166754806080. Its totient is φ = 124279585956288.

The previous prime is 131221212232003. The next prime is 131221212232031. The reversal of 131221212232021 is 120232212122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131221212232021 - 2⁹ = 131221212231509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221212232031) 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, 979005796 + ... + 979139821.

It is an arithmetic number, because the mean of its divisors is an integer number (17270844350760).

Almost surely, 2^{131221212232021} is an apocalyptic number.

It is an amenable number.

131221212232021 is a deficient number, since it is larger than the sum of its proper divisors (6945542574059).

131221212232021 is a wasteful number, since it uses less digits than its factorization.

131221212232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958149163.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 131221212232021 its reverse (120232212122131), we get a palindrome (251453424354152).

The spelling of 131221212232021 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred thirty-two thousand, twenty-one".