210221001121 has 8 divisors (see below), whose sum is σ = 219457016064. Its totient is φ = 200992983840.

The previous prime is 210221001091. The next prime is 210221001139. The reversal of 210221001121 is 121100122012.

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 210221001121 - 2¹³ = 210220992929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210221001521) 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, 1945660 + ... + 2050861.

It is an arithmetic number, because the mean of its divisors is an integer number (27432127008).

Almost surely, 2^210221001121 is an apocalyptic number.

It is an amenable number.

210221001121 is a deficient number, since it is larger than the sum of its proper divisors (9236014943).

210221001121 is a wasteful number, since it uses less digits than its factorization.

210221001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998831.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210221001121 its reverse (121100122012), we get a palindrome (331321123133).

It can be divided in two parts, 210221001 and 121, that multiplied together give a square (25436741121 = 159489²).

The spelling of 210221001121 in words is "two hundred ten billion, two hundred twenty-one million, one thousand, one hundred twenty-one".