1213211145 has 8 divisors (see below), whose sum is σ = 1941137856. Its totient is φ = 647045936.

The previous prime is 1213211089. The next prime is 1213211173. The reversal of 1213211145 is 5411123121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213211145 - 2⁶ = 1213211081 is a prime.

It is a super-2 number, since 2×1213211145² = 2943762564704422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40440357 + ... + 40440386.

It is an arithmetic number, because the mean of its divisors is an integer number (242642232).

Almost surely, 2^1213211145 is an apocalyptic number.

1213211145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213211145 is a deficient number, since it is larger than the sum of its proper divisors (727926711).

1213211145 is an equidigital number, since it uses as much as digits as its factorization.

1213211145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80880751.

The product of its digits is 240, while the sum is 21.

The square root of 1213211145 is about 34831.1806432110. The cubic root of 1213211145 is about 1066.5440496531.

Adding to 1213211145 its reverse (5411123121), we get a palindrome (6624334266).

The spelling of 1213211145 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, one hundred forty-five".