121211021211 has 64 divisors (see below), whose sum is σ = 191130648576. Its totient is φ = 66890707200.

The previous prime is 121211021161. The next prime is 121211021249. The reversal of 121211021211 is 112120112121.

It is a happy number.

It is not a de Polignac number, because 121211021211 - 2⁷ = 121211021083 is a prime.

It is a super-2 number, since 2×121211021211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121211021011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38031360 + ... + 38034546.

It is an arithmetic number, because the mean of its divisors is an integer number (2986416384).

Almost surely, 2^121211021211 is an apocalyptic number.

121211021211 is a deficient number, since it is larger than the sum of its proper divisors (69919627365).

121211021211 is a wasteful number, since it uses less digits than its factorization.

121211021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211021211 its reverse (112120112121), we get a palindrome (233331133332).

It can be divided in two parts, 1212110 and 21211, that added together give a palindrome (1233321).

The spelling of 121211021211 in words is "one hundred twenty-one billion, two hundred eleven million, twenty-one thousand, two hundred eleven".