210221112211121 has 16 divisors (see below), whose sum is σ = 237274516728000. Its totient is φ = 184493350641600.

The previous prime is 210221112211109. The next prime is 210221112211127. The reversal of 210221112211121 is 121112211122012.

It is a happy number.

It is not a de Polignac number, because 210221112211121 - 2³⁴ = 210203932341937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221112211093 and 210221112211102.

It is not an unprimeable number, because it can be changed into a prime (210221112211127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45559790 + ... + 49961351.

It is an arithmetic number, because the mean of its divisors is an integer number (14829657295500).

Almost surely, 2^{210221112211121} is an apocalyptic number.

It is an amenable number.

210221112211121 is a deficient number, since it is larger than the sum of its proper divisors (27053404516879).

210221112211121 is a wasteful number, since it uses less digits than its factorization.

210221112211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95528080.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 210221112211121 its reverse (121112211122012), we get a palindrome (331333323333133).

It can be divided in two parts, 21022111 and 2211121, that added together give a palindrome (23233232).

The spelling of 210221112211121 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twelve million, two hundred eleven thousand, one hundred twenty-one".