201210121221 has 8 divisors (see below), whose sum is σ = 268289669760. Its totient is φ = 134135326752.

The previous prime is 201210121219. The next prime is 201210121237. The reversal of 201210121221 is 122121012102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201210121221 - 2¹ = 201210121219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201210121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210821221) 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, 1088560 + ... + 1259913.

It is an arithmetic number, because the mean of its divisors is an integer number (33536208720).

Almost surely, 2^201210121221 is an apocalyptic number.

It is an amenable number.

201210121221 is a deficient number, since it is larger than the sum of its proper divisors (67079548539).

201210121221 is a wasteful number, since it uses less digits than its factorization.

201210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377035.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201210121221 its reverse (122121012102), we get a palindrome (323331133323).

The spelling of 201210121221 in words is "two hundred one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".