121111211010 has 64 divisors (see below), whose sum is σ = 297141903360. Its totient is φ = 31582614720.

The previous prime is 121111211009. The next prime is 121111211047. The reversal of 121111211010 is 10112111121.

It is a super-3 number, since 3×121111211010³ (a number of 34 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158949 + ... + 517191.

It is an arithmetic number, because the mean of its divisors is an integer number (4642842240).

Almost surely, 2^121111211010 is an apocalyptic number.

121111211010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121111211010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148570951680).

121111211010 is an abundant number, since it is smaller than the sum of its proper divisors (176030692350).

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

121111211010 is a wasteful number, since it uses less digits than its factorization.

121111211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358503.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121111211010 its reverse (10112111121), we get a palindrome (131223322131).

The spelling of 121111211010 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred eleven thousand, ten".