121111101010 has 16 divisors (see below), whose sum is σ = 225032239872. Its totient is φ = 46881716400.

The previous prime is 121111100993. The next prime is 121111101011. The reversal of 121111101010 is 10101111121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121111101011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195340176 + ... + 195340795.

It is an arithmetic number, because the mean of its divisors is an integer number (14064514992).

Almost surely, 2^121111101010 is an apocalyptic number.

121111101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121111101010 is a deficient number, since it is larger than the sum of its proper divisors (103921138862).

121111101010 is a wasteful number, since it uses less digits than its factorization.

121111101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390681009.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 121111101010 its reverse (10101111121), we get a palindrome (131212212131).

The spelling of 121111101010 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred one thousand, ten".