421516371757 has 8 divisors (see below), whose sum is σ = 454085457336. Its totient is φ = 388967964672.

The previous prime is 421516371721. The next prime is 421516371769. The reversal of 421516371757 is 757173615124.

It can be written as a sum of positive squares in 4 ways, for example, as 260257103716 + 161259268041 = 510154^2 + 401571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421516371757 - 2¹⁹ = 421515847469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421516371757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421516371707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5127268 + ... + 5208829.

It is an arithmetic number, because the mean of its divisors is an integer number (56760682167).

Almost surely, 2^421516371757 is an apocalyptic number.

It is an amenable number.

421516371757 is a deficient number, since it is larger than the sum of its proper divisors (32569085579).

421516371757 is a wasteful number, since it uses less digits than its factorization.

421516371757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10339247.

The product of its digits is 1234800, while the sum is 49.

The spelling of 421516371757 in words is "four hundred twenty-one billion, five hundred sixteen million, three hundred seventy-one thousand, seven hundred fifty-seven".