1212552121 has 4 divisors (see below), whose sum is σ = 1322784144. Its totient is φ = 1102320100.

The previous prime is 1212552101. The next prime is 1212552151.

It is a happy number.

1212552121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212552121 - 2⁹ = 1212551609 is a prime.

It is a super-2 number, since 2×1212552121² = 2940565292283197282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212552092 and 1212552101.

It is not an unprimeable number, because it can be changed into a prime (1212552101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55115995 + ... + 55116016.

It is an arithmetic number, because the mean of its divisors is an integer number (330696036).

Almost surely, 2^1212552121 is an apocalyptic number.

1212552121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212552121 is a deficient number, since it is larger than the sum of its proper divisors (110232023).

1212552121 is a wasteful number, since it uses less digits than its factorization.

1212552121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110232022.

The product of its digits is 400, while the sum is 22.

The square root of 1212552121 is about 34821.7190988613. The cubic root of 1212552121 is about 1066.3508968409.

It can be divided in two parts, 12125 and 52121, that added together give a palindrome (64246).

The spelling of 1212552121 in words is "one billion, two hundred twelve million, five hundred fifty-two thousand, one hundred twenty-one".