210856374481 has 9 divisors (see below), whose sum is σ = 212331845019. Its totient is φ = 209391096000.

The previous prime is 210856374437. The next prime is 210856374503. The reversal of 210856374481 is 184473658012.

The square root of 210856374481 is 459191.

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

It can be written as a sum of positive squares in only one way, i.e., 206442100881 + 4414273600 = 454359^2 + 66440^2 .

It is not a de Polignac number, because 210856374481 - 2¹³ = 210856366289 is a prime.

It is a super-2 number, since 2×210856374481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210856374181) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 69336321 + ... + 69339361.

Almost surely, 2^210856374481 is an apocalyptic number.

210856374481 is the 459191-st square number.

210856374481 is the 229596-th centered octagonal number.

It is an amenable number.

210856374481 is a deficient number, since it is larger than the sum of its proper divisors (1475470538).

210856374481 is an frugal number, since it uses more digits than its factorization.

210856374481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384 (or 3192 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

Multiplying 210856374481 by its sum of digits (49), we get a square (10331962349569 = 3214337²).

The spelling of 210856374481 in words is "two hundred ten billion, eight hundred fifty-six million, three hundred seventy-four thousand, four hundred eighty-one".