152212121 has 4 divisors (see below), whose sum is σ = 152356644. Its totient is φ = 152067600.

The previous prime is 152212079. The next prime is 152212133. The reversal of 152212121 is 121212251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113635600 + 38576521 = 10660^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 152212121 - 2¹⁴ = 152195737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 152212121.

It is not an unprimeable number, because it can be changed into a prime (152211121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70670 + ... + 72791.

It is an arithmetic number, because the mean of its divisors is an integer number (38089161).

Almost surely, 2^152212121 is an apocalyptic number.

It is an amenable number.

152212121 is a deficient number, since it is larger than the sum of its proper divisors (144523).

152212121 is a wasteful number, since it uses less digits than its factorization.

152212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144522.

The product of its digits is 80, while the sum is 17.

The square root of 152212121 is about 12337.4276492306. The cubic root of 152212121 is about 533.9284705024.

Adding to 152212121 its reverse (121212251), we get a palindrome (273424372).

The spelling of 152212121 in words is "one hundred fifty-two million, two hundred twelve thousand, one hundred twenty-one".