398210219521 has 3 divisors (see below), whose sum is σ = 398210850561. Its totient is φ = 398209588482.

The previous prime is 398210219501. The next prime is 398210219551. The reversal of 398210219521 is 125912012893.

The square root of 398210219521 is 631039.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 398210219521 - 2⁵ = 398210219489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398210219501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 315520 + ... + 946558.

It is an arithmetic number, because the mean of its divisors is an integer number (132736950187).

Almost surely, 2^398210219521 is an apocalyptic number.

398210219521 is the 631039-th square number.

398210219521 is the 315520-th centered octagonal number.

It is an amenable number.

398210219521 is a deficient number, since it is larger than the sum of its proper divisors (631040).

398210219521 is an frugal number, since it uses more digits than its factorization.

398210219521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262078 (or 631039 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 398210219521 in words is "three hundred ninety-eight billion, two hundred ten million, two hundred nineteen thousand, five hundred twenty-one".