420421340021381 has 2 divisors, whose sum is σ = 420421340021382. Its totient is φ = 420421340021380.

The previous prime is 420421340021321. The next prime is 420421340021387. The reversal of 420421340021381 is 183120043124024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332917756729156 + 87503583292225 = 18246034^2 + 9354335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420421340021381 is a prime.

It is a super-2 number, since 2×420421340021381² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420421340021387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210210670010690 + 210210670010691.

It is an arithmetic number, because the mean of its divisors is an integer number (210210670010691).

Almost surely, 2^{420421340021381} is an apocalyptic number.

It is an amenable number.

420421340021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

420421340021381 is an equidigital number, since it uses as much as digits as its factorization.

420421340021381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 420421340021381 in words is "four hundred twenty trillion, four hundred twenty-one billion, three hundred forty million, twenty-one thousand, three hundred eighty-one".