121221201101 has 32 divisors (see below), whose sum is σ = 166728312576. Its totient is φ = 85065408000.

The previous prime is 121221201091. The next prime is 121221201103. The reversal of 121221201101 is 101102122121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221201101 is a prime.

It is a super-2 number, since 2×121221201101² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221201103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1435790 + ... + 1517871.

It is an arithmetic number, because the mean of its divisors is an integer number (5210259768).

Almost surely, 2^121221201101 is an apocalyptic number.

121221201101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221201101 is a deficient number, since it is larger than the sum of its proper divisors (45507111475).

121221201101 is a wasteful number, since it uses less digits than its factorization.

121221201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953733.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221201101 its reverse (101102122121), we get a palindrome (222323323222).

The spelling of 121221201101 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred one".