131223214012421 has 4 divisors (see below), whose sum is σ = 131223260905644. Its totient is φ = 131223167119200.

The previous prime is 131223214012381. The next prime is 131223214012427. The reversal of 131223214012421 is 124210412322131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43680057409921 + 87543156602500 = 6609089^2 + 9356450^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223214012421 - 2¹⁴ = 131223213996037 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 (131223214012427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18963350 + ... + 24941031.

It is an arithmetic number, because the mean of its divisors is an integer number (32805815226411).

Almost surely, 2^{131223214012421} is an apocalyptic number.

It is an amenable number.

131223214012421 is a deficient number, since it is larger than the sum of its proper divisors (46893223).

131223214012421 is an equidigital number, since it uses as much as digits as its factorization.

131223214012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46893222.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 131223214012421 its reverse (124210412322131), we get a palindrome (255433626334552).

The spelling of 131223214012421 in words is "one hundred thirty-one trillion, two hundred twenty-three billion, two hundred fourteen million, twelve thousand, four hundred twenty-one".