121221001211 has 12 divisors (see below), whose sum is σ = 121879286928. Its totient is φ = 120566027232.

The previous prime is 121221001207. The next prime is 121221001247. The reversal of 121221001211 is 112100122121.

It is not a de Polignac number, because 121221001211 - 2² = 121221001207 is a prime.

It is a super-2 number, since 2×121221001211² (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 (121221001201) 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, 58082810 + ... + 58084896.

It is an arithmetic number, because the mean of its divisors is an integer number (10156607244).

Almost surely, 2^121221001211 is an apocalyptic number.

121221001211 is a deficient number, since it is larger than the sum of its proper divisors (658285717).

121221001211 is an frugal number, since it uses more digits than its factorization.

121221001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398 (or 3121 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221001211 its reverse (112100122121), we get a palindrome (233321123332).

The spelling of 121221001211 in words is "one hundred twenty-one billion, two hundred twenty-one million, one thousand, two hundred eleven".