201221212202101 has 64 divisors (see below), whose sum is σ = 250809753600000. Its totient is φ = 157194169171200.

The previous prime is 201221212202057. The next prime is 201221212202147. The reversal of 201221212202101 is 101202212122102.

It is not a de Polignac number, because 201221212202101 - 2⁷ = 201221212201973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221212262101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12077370711 + ... + 12077387371.

It is an arithmetic number, because the mean of its divisors is an integer number (3918902400000).

Almost surely, 2^{201221212202101} is an apocalyptic number.

It is an amenable number.

201221212202101 is a deficient number, since it is larger than the sum of its proper divisors (49588541397899).

201221212202101 is a wasteful number, since it uses less digits than its factorization.

201221212202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22010.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201221212202101 its reverse (101202212122102), we get a palindrome (302423424324203).

The spelling of 201221212202101 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred one".