1243213401 has 8 divisors (see below), whose sum is σ = 1674707104. Its totient is φ = 820264320.

The previous prime is 1243213393. The next prime is 1243213409. The reversal of 1243213401 is 1043123421.

It is an interprime number because it is at equal distance from previous prime (1243213393) and next prime (1243213409).

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

It is not a de Polignac number, because 1243213401 - 2³ = 1243213393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243213409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135815 + ... + 2136396.

It is an arithmetic number, because the mean of its divisors is an integer number (209338388).

Almost surely, 2^1243213401 is an apocalyptic number.

It is an amenable number.

1243213401 is a deficient number, since it is larger than the sum of its proper divisors (431493703).

1243213401 is an equidigital number, since it uses as much as digits as its factorization.

1243213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272311.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1243213401 is about 35259.2314295136. The cubic root of 1243213401 is about 1075.2643016255.

Adding to 1243213401 its reverse (1043123421), we get a palindrome (2286336822).

The spelling of 1243213401 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, four hundred one".