421651802973 has 4 divisors (see below), whose sum is σ = 562202403968. Its totient is φ = 281101201980.

The previous prime is 421651802959. The next prime is 421651802981. The reversal of 421651802973 is 379208156124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 421651802973 - 2²⁰ = 421650754397 is a prime.

It is a super-2 number, since 2×421651802973² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421651802933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70275300493 + ... + 70275300498.

It is an arithmetic number, because the mean of its divisors is an integer number (140550600992).

It is a 1-persistent number, because it is pandigital, but 2⋅421651802973 = 843303605946 is not.

Almost surely, 2^421651802973 is an apocalyptic number.

It is an amenable number.

421651802973 is a deficient number, since it is larger than the sum of its proper divisors (140550600995).

421651802973 is a wasteful number, since it uses less digits than its factorization.

421651802973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140550600994.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 421651802973 in words is "four hundred twenty-one billion, six hundred fifty-one million, eight hundred two thousand, nine hundred seventy-three".