421544640751 has 32 divisors (see below), whose sum is σ = 466603042752. Its totient is φ = 378426746880.

The previous prime is 421544640743. The next prime is 421544640773. The reversal of 421544640751 is 157046445124.

It is not a de Polignac number, because 421544640751 - 2³ = 421544640743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421544640698 and 421544640707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421544640151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98650951 + ... + 98655223.

It is an arithmetic number, because the mean of its divisors is an integer number (14581345086).

Almost surely, 2^421544640751 is an apocalyptic number.

421544640751 is a deficient number, since it is larger than the sum of its proper divisors (45058402001).

421544640751 is a wasteful number, since it uses less digits than its factorization.

421544640751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 421544640751 in words is "four hundred twenty-one billion, five hundred forty-four million, six hundred forty thousand, seven hundred fifty-one".