121211101011 has 192 divisors, whose sum is σ = 229231973376. Its totient is φ = 55956096000.

The previous prime is 121211101009. The next prime is 121211101021. The reversal of 121211101011 is 110101112121.

It is not a de Polignac number, because 121211101011 - 2¹ = 121211101009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211101021) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 78554706 + ... + 78556248.

It is an arithmetic number, because the mean of its divisors is an integer number (1193916528).

Almost surely, 2^121211101011 is an apocalyptic number.

121211101011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121211101011 is a deficient number, since it is larger than the sum of its proper divisors (108020872365).

121211101011 is a wasteful number, since it uses less digits than its factorization.

121211101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1715 counting only the distinct ones).

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

Adding to 121211101011 its reverse (110101112121), we get a palindrome (231312213132).

It can be divided in two parts, 12121110 and 1011, that added together give a palindrome (12122121).

The spelling of 121211101011 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred one thousand, eleven".