420221093987477 has 2 divisors, whose sum is σ = 420221093987478. Its totient is φ = 420221093987476.

The previous prime is 420221093987467. The next prime is 420221093987581. The reversal of 420221093987477 is 774789390122024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316301031801316 + 103920062186161 = 17784854^2 + 10194119^2 .

It is a cyclic number.

It is not a de Polignac number, because 420221093987477 - 2²⁰ = 420221092938901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420221093987407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210110546993738 + 210110546993739.

It is an arithmetic number, because the mean of its divisors is an integer number (210110546993739).

Almost surely, 2^{420221093987477} is an apocalyptic number.

It is an amenable number.

420221093987477 is a deficient number, since it is larger than the sum of its proper divisors (1).

420221093987477 is an equidigital number, since it uses as much as digits as its factorization.

420221093987477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 85349376, while the sum is 65.

The spelling of 420221093987477 in words is "four hundred twenty trillion, two hundred twenty-one billion, ninety-three million, nine hundred eighty-seven thousand, four hundred seventy-seven".