210221056523 has 4 divisors (see below), whose sum is σ = 210325283160. Its totient is φ = 210116829888.

The previous prime is 210221056457. The next prime is 210221056531. The reversal of 210221056523 is 325650122012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210221056523 - 2¹² = 210221052427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210221056553) 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, 52110293 + ... + 52114326.

It is an arithmetic number, because the mean of its divisors is an integer number (52581320790).

Almost surely, 2^210221056523 is an apocalyptic number.

210221056523 is a deficient number, since it is larger than the sum of its proper divisors (104226637).

210221056523 is a wasteful number, since it uses less digits than its factorization.

210221056523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104226636.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 210221056523 its reverse (325650122012), we get a palindrome (535871178535).

The spelling of 210221056523 in words is "two hundred ten billion, two hundred twenty-one million, fifty-six thousand, five hundred twenty-three".