201221211012121 has 8 divisors (see below), whose sum is σ = 204849302137344. Its totient is φ = 197615175152640.

The previous prime is 201221211012103. The next prime is 201221211012161. The reversal of 201221211012121 is 121210112122102.

It is a happy number.

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 201221211012121 - 2¹⁵ = 201221210979353 is a prime.

It is a super-2 number, since 2×201221211012121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221211012161) 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, 5513798025 + ... + 5513834518.

It is an arithmetic number, because the mean of its divisors is an integer number (25606162767168).

Almost surely, 2^{201221211012121} is an apocalyptic number.

It is an amenable number.

201221211012121 is a deficient number, since it is larger than the sum of its proper divisors (3628091125223).

201221211012121 is a wasteful number, since it uses less digits than its factorization.

201221211012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11027632871.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201221211012121 its reverse (121210112122102), we get a palindrome (322431323134223).

The spelling of 201221211012121 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred eleven million, twelve thousand, one hundred twenty-one".