121211100012 has 24 divisors (see below), whose sum is σ = 290469844336. Its totient is φ = 39311707968.

The previous prime is 121211099983. The next prime is 121211100029. The reversal of 121211100012 is 210001112121.

It is a super-2 number, since 2×121211100012² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136498543 + ... + 136499430.

Almost surely, 2^121211100012 is an apocalyptic number.

121211100012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121211100012 is an abundant number, since it is smaller than the sum of its proper divisors (169258744324).

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

121211100012 is a wasteful number, since it uses less digits than its factorization.

121211100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272998017 (or 272998015 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121211100012 its reverse (210001112121), we get a palindrome (331212212133).

The spelling of 121211100012 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thousand, twelve".