1967271421 has 2 divisors, whose sum is σ = 1967271422. Its totient is φ = 1967271420.

The previous prime is 1967271413. The next prime is 1967271431. The reversal of 1967271421 is 1241727691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1697852025 + 269419396 = 41205^2 + 16414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1967271421 - 2³ = 1967271413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1967271431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983635710 + 983635711.

It is an arithmetic number, because the mean of its divisors is an integer number (983635711).

Almost surely, 2^1967271421 is an apocalyptic number.

It is an amenable number.

1967271421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1967271421 is an equidigital number, since it uses as much as digits as its factorization.

1967271421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 1967271421 is about 44353.9335459664. The cubic root of 1967271421 is about 1253.0106461330.

The spelling of 1967271421 in words is "one billion, nine hundred sixty-seven million, two hundred seventy-one thousand, four hundred twenty-one".