1213322001 has 4 divisors (see below), whose sum is σ = 1617762672. Its totient is φ = 808881332.

The previous prime is 1213321997. The next prime is 1213322003. The reversal of 1213322001 is 1002233121.

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 1213322001 - 2² = 1213321997 is a prime.

It is a super-2 number, since 2×1213322001² = 2944300556221288002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213322003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202220331 + ... + 202220336.

It is an arithmetic number, because the mean of its divisors is an integer number (404440668).

Almost surely, 2^1213322001 is an apocalyptic number.

It is an amenable number.

1213322001 is a deficient number, since it is larger than the sum of its proper divisors (404440671).

1213322001 is an equidigital number, since it uses as much as digits as its factorization.

1213322001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404440670.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1213322001 is about 34832.7719396548. The cubic root of 1213322001 is about 1066.5765334756.

Adding to 1213322001 its reverse (1002233121), we get a palindrome (2215555122).

The spelling of 1213322001 in words is "one billion, two hundred thirteen million, three hundred twenty-two thousand, one".