220131133421 has 2 divisors, whose sum is σ = 220131133422. Its totient is φ = 220131133420.

The previous prime is 220131133403. The next prime is 220131133423. The reversal of 220131133421 is 124331131022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143803257796 + 76327875625 = 379214^2 + 276275^2 .

It is a cyclic number.

It is not a de Polignac number, because 220131133421 - 2⁶ = 220131133357 is a prime.

Together with 220131133423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220131133423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110065566710 + 110065566711.

It is an arithmetic number, because the mean of its divisors is an integer number (110065566711).

Almost surely, 2^220131133421 is an apocalyptic number.

It is an amenable number.

220131133421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220131133421 is an equidigital number, since it uses as much as digits as its factorization.

220131133421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 220131133421 its reverse (124331131022), we get a palindrome (344462264443).

The spelling of 220131133421 in words is "two hundred twenty billion, one hundred thirty-one million, one hundred thirty-three thousand, four hundred twenty-one".