121521344211 has 12 divisors (see below), whose sum is σ = 177340427992. Its totient is φ = 80179030656.

The previous prime is 121521344201. The next prime is 121521344251. The reversal of 121521344211 is 112443125121.

121521344211 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 213 + 442 + 1 + 1 = 666.

It is not a de Polignac number, because 121521344211 - 2⁷ = 121521344083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121521344201) 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, 69598981 + ... + 69600726.

Almost surely, 2^121521344211 is an apocalyptic number.

121521344211 is a deficient number, since it is larger than the sum of its proper divisors (55819083781).

121521344211 is a wasteful number, since it uses less digits than its factorization.

121521344211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139199810 (or 139199807 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

Adding to 121521344211 its reverse (112443125121), we get a palindrome (233964469332).

The spelling of 121521344211 in words is "one hundred twenty-one billion, five hundred twenty-one million, three hundred forty-four thousand, two hundred eleven".