121200210000221 has 24 divisors (see below), whose sum is σ = 133695410298912. Its totient is φ = 109788893676000.

The previous prime is 121200210000151. The next prime is 121200210000421. The reversal of 121200210000221 is 122000012002121.

It is not a de Polignac number, because 121200210000221 - 2³⁸ = 120925332093277 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121200210000196 and 121200210000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200210000421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1636675646 + ... + 1636749696.

It is an arithmetic number, because the mean of its divisors is an integer number (5570642095788).

Almost surely, 2^{121200210000221} is an apocalyptic number.

121200210000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121200210000221 is a deficient number, since it is larger than the sum of its proper divisors (12495200298691).

121200210000221 is a wasteful number, since it uses less digits than its factorization.

121200210000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122153 (or 122142 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121200210000221 its reverse (122000012002121), we get a palindrome (243200222002342).

The spelling of 121200210000221 in words is "one hundred twenty-one trillion, two hundred billion, two hundred ten million, two hundred twenty-one", and thus it is an aban number.