1221122153 has 4 divisors (see below), whose sum is σ = 1285391760. Its totient is φ = 1156852548.

The previous prime is 1221122099. The next prime is 1221122159. The reversal of 1221122153 is 3512211221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3512211221 = 67 ⋅52421063.

It is a cyclic number.

It is not a de Polignac number, because 1221122153 - 2⁸ = 1221121897 is a prime.

It is a super-2 number, since 2×1221122153² = 2982278625094710818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221122159) 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, 32134775 + ... + 32134812.

It is an arithmetic number, because the mean of its divisors is an integer number (321347940).

Almost surely, 2^1221122153 is an apocalyptic number.

It is an amenable number.

1221122153 is a deficient number, since it is larger than the sum of its proper divisors (64269607).

1221122153 is an equidigital number, since it uses as much as digits as its factorization.

1221122153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64269606.

The product of its digits is 240, while the sum is 20.

The square root of 1221122153 is about 34944.5582745011. The cubic root of 1221122153 is about 1068.8572400945.

Adding to 1221122153 its reverse (3512211221), we get a palindrome (4733333374).

The spelling of 1221122153 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred fifty-three".