121211200209 has 32 divisors (see below), whose sum is σ = 184797978624. Its totient is φ = 69952164480.

The previous prime is 121211200129. The next prime is 121211200223. The reversal of 121211200209 is 902002112121.

It is not a de Polignac number, because 121211200209 - 2⁸ = 121211199953 is a prime.

It is a super-2 number, since 2×121211200209² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121211200109) 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, 188812 + ... + 527325.

It is an arithmetic number, because the mean of its divisors is an integer number (5774936832).

Almost surely, 2^121211200209 is an apocalyptic number.

It is an amenable number.

121211200209 is a deficient number, since it is larger than the sum of its proper divisors (63586778415).

121211200209 is a wasteful number, since it uses less digits than its factorization.

121211200209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716397.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121211200209 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thousand, two hundred nine".