421557646515401 has 32 divisors (see below), whose sum is σ = 489056529240576. Its totient is φ = 359118604800000.

The previous prime is 421557646515373. The next prime is 421557646515463. The reversal of 421557646515401 is 104515646755124.

It is a cyclic number.

It is not a de Polignac number, because 421557646515401 - 2³⁰ = 421556572773577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421557646515601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213128891 + ... + 215097743.

It is an arithmetic number, because the mean of its divisors is an integer number (15283016538768).

Almost surely, 2^{421557646515401} is an apocalyptic number.

It is an amenable number.

421557646515401 is a deficient number, since it is larger than the sum of its proper divisors (67498882725175).

421557646515401 is a wasteful number, since it uses less digits than its factorization.

421557646515401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973873.

The product of its (nonzero) digits is 20160000, while the sum is 56.

The spelling of 421557646515401 in words is "four hundred twenty-one trillion, five hundred fifty-seven billion, six hundred forty-six million, five hundred fifteen thousand, four hundred one".