121231201212 has 36 divisors (see below), whose sum is σ = 334304222616. Its totient is φ = 36736727520.

The previous prime is 121231201207. The next prime is 121231201237. The reversal of 121231201212 is 212102132121.

121231201212 is a `hidden beast` number, since 1 + 21 + 231 + 201 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153069303 + ... + 153070094.

It is an arithmetic number, because the mean of its divisors is an integer number (9286228406).

Almost surely, 2^121231201212 is an apocalyptic number.

121231201212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121231201212 is an abundant number, since it is smaller than the sum of its proper divisors (213073021404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121231201212 is a wasteful number, since it uses less digits than its factorization.

121231201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306139418 (or 306139413 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121231201212 its reverse (212102132121), we get a palindrome (333333333333).

The spelling of 121231201212 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred one thousand, two hundred twelve".