121021221211 has 12 divisors (see below), whose sum is σ = 136732666824. Its totient is φ = 106225515200.

The previous prime is 121021221199. The next prime is 121021221241. The reversal of 121021221211 is 112122120121.

It is not a de Polignac number, because 121021221211 - 2¹⁷ = 121021090139 is a prime.

It is a super-2 number, since 2×121021221211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021221241) 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, 6531730 + ... + 6550231.

It is an arithmetic number, because the mean of its divisors is an integer number (11394388902).

Almost surely, 2^121021221211 is an apocalyptic number.

121021221211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121021221211 is a deficient number, since it is larger than the sum of its proper divisors (15711445613).

121021221211 is a wasteful number, since it uses less digits than its factorization.

121021221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13082030 (or 13082001 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121021221211 its reverse (112122120121), we get a palindrome (233143341332).

The spelling of 121021221211 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred eleven".