12381970421 has 2 divisors, whose sum is σ = 12381970422. Its totient is φ = 12381970420.

The previous prime is 12381970411. The next prime is 12381970423. The reversal of 12381970421 is 12407918321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9328855396 + 3053115025 = 96586^2 + 55255^2 .

It is a cyclic number.

It is not a de Polignac number, because 12381970421 - 2¹⁴ = 12381954037 is a prime.

Together with 12381970423, 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 (12381970423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190985210 + 6190985211.

It is an arithmetic number, because the mean of its divisors is an integer number (6190985211).

Almost surely, 2^12381970421 is an apocalyptic number.

It is an amenable number.

12381970421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381970421 is an equidigital number, since it uses as much as digits as its factorization.

12381970421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 12381970421 in words is "twelve billion, three hundred eighty-one million, nine hundred seventy thousand, four hundred twenty-one".