986421421421 has 2 divisors, whose sum is σ = 986421421422. Its totient is φ = 986421421420.

The previous prime is 986421421379. The next prime is 986421421519. The reversal of 986421421421 is 124124124689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501385783396 + 485035638025 = 708086^2 + 696445^2 .

It is a cyclic number.

It is not a de Polignac number, because 986421421421 - 2⁶ = 986421421357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986421424421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493210710710 + 493210710711.

It is an arithmetic number, because the mean of its divisors is an integer number (493210710711).

Almost surely, 2^986421421421 is an apocalyptic number.

It is an amenable number.

986421421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

986421421421 is an equidigital number, since it uses as much as digits as its factorization.

986421421421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The spelling of 986421421421 in words is "nine hundred eighty-six billion, four hundred twenty-one million, four hundred twenty-one thousand, four hundred twenty-one".