121211133100 has 36 divisors (see below), whose sum is σ = 269443488888. Its totient is φ = 47301904000.

The previous prime is 121211133097. The next prime is 121211133103. The reversal of 121211133100 is 1331112121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121211133097) and next prime (121211133103).

It is a super-2 number, since 2×121211133100² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121211133103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14777746 + ... + 14785945.

It is an arithmetic number, because the mean of its divisors is an integer number (7484541358).

Almost surely, 2^121211133100 is an apocalyptic number.

121211133100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211133100 is an abundant number, since it is smaller than the sum of its proper divisors (148232355788).

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

121211133100 is a wasteful number, since it uses less digits than its factorization.

121211133100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29563746 (or 29563739 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 121211133100 its reverse (1331112121), we get a palindrome (122542245221).

The spelling of 121211133100 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thirty-three thousand, one hundred".