121221202021101 has 96 divisors (see below), whose sum is σ = 223520181201408. Its totient is φ = 61596753523200.

The previous prime is 121221202021097. The next prime is 121221202021109. The reversal of 121221202021101 is 101120202122121.

121221202021101 is a `hidden beast` number, since 121 + 221 + 20 + 202 + 1 + 101 = 666.

It is not a de Polignac number, because 121221202021101 - 2² = 121221202021097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221202021109) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16742881 + ... + 22864086.

It is an arithmetic number, because the mean of its divisors is an integer number (2328335220848).

Almost surely, 2^{121221202021101} is an apocalyptic number.

It is an amenable number.

121221202021101 is a deficient number, since it is larger than the sum of its proper divisors (102298979180307).

121221202021101 is a wasteful number, since it uses less digits than its factorization.

121221202021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39607131 (or 39607128 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221202021101 its reverse (101120202122121), we get a palindrome (222341404143222).

It can be divided in two parts, 12122120 and 2021101, that added together give a triangular number (14143221 = T₅₃₁₈).

The spelling of 121221202021101 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty-one thousand, one hundred one".