1212310421 has 6 divisors (see below), whose sum is σ = 1410238710. Its totient is φ = 1039123176.

The previous prime is 1212310399. The next prime is 1212310423. The reversal of 1212310421 is 1240132121.

It can be written as a sum of positive squares in only one way, i.e., 764522500 + 447787921 = 27650^2 + 21161^2 .

It is not a de Polignac number, because 1212310421 - 2⁶ = 1212310357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212310421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212310423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12370466 + ... + 12370563.

It is an arithmetic number, because the mean of its divisors is an integer number (235039785).

Almost surely, 2^1212310421 is an apocalyptic number.

It is an amenable number.

1212310421 is a deficient number, since it is larger than the sum of its proper divisors (197928289).

1212310421 is an equidigital number, since it uses as much as digits as its factorization.

1212310421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24741043 (or 24741036 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1212310421 is about 34818.2483907505. The cubic root of 1212310421 is about 1066.2800396425.

Adding to 1212310421 its reverse (1240132121), we get a palindrome (2452442542).

The spelling of 1212310421 in words is "one billion, two hundred twelve million, three hundred ten thousand, four hundred twenty-one".