1212201121 has 16 divisors (see below), whose sum is σ = 1309674240. Its totient is φ = 1118206080.

The previous prime is 1212201113. The next prime is 1212201127. The reversal of 1212201121 is 1211022121.

It is a cyclic number.

It is not a de Polignac number, because 1212201121 - 2³ = 1212201113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212201127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507496 + ... + 509878.

It is an arithmetic number, because the mean of its divisors is an integer number (81854640).

Almost surely, 2^1212201121 is an apocalyptic number.

It is an amenable number.

1212201121 is a deficient number, since it is larger than the sum of its proper divisors (97473119).

1212201121 is a wasteful number, since it uses less digits than its factorization.

1212201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212201121 is about 34816.6787761268. The cubic root of 1212201121 is about 1066.2479939692.

Adding to 1212201121 its reverse (1211022121), we get a palindrome (2423223242).

It can be divided in two parts, 1212201 and 121, that multiplied together give a square (146676321 = 12111²).

The spelling of 1212201121 in words is "one billion, two hundred twelve million, two hundred one thousand, one hundred twenty-one".