8231428222421 has 2 divisors, whose sum is σ = 8231428222422. Its totient is φ = 8231428222420.

The previous prime is 8231428222411. The next prime is 8231428222541. The reversal of 8231428222421 is 1242228241328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4937457317521 + 3293970904900 = 2222039^2 + 1814930^2 .

It is a cyclic number.

It is not a de Polignac number, because 8231428222421 - 2⁶ = 8231428222357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8231428222411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4115714111210 + 4115714111211.

It is an arithmetic number, because the mean of its divisors is an integer number (4115714111211).

Almost surely, 2^{8231428222421} is an apocalyptic number.

It is an amenable number.

8231428222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8231428222421 is an equidigital number, since it uses as much as digits as its factorization.

8231428222421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196608, while the sum is 41.

The spelling of 8231428222421 in words is "eight trillion, two hundred thirty-one billion, four hundred twenty-eight million, two hundred twenty-two thousand, four hundred twenty-one".