1212031421 has 4 divisors (see below), whose sum is σ = 1213351200. Its totient is φ = 1210711644.

The previous prime is 1212031409. The next prime is 1212031427. The reversal of 1212031421 is 1241302121.

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 1212031421 - 2⁶ = 1212031357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212031427) 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, 658511 + ... + 660348.

It is an arithmetic number, because the mean of its divisors is an integer number (303337800).

Almost surely, 2^1212031421 is an apocalyptic number.

It is an amenable number.

1212031421 is a deficient number, since it is larger than the sum of its proper divisors (1319779).

1212031421 is an equidigital number, since it uses as much as digits as its factorization.

1212031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319778.

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

The square root of 1212031421 is about 34814.2416404551. The cubic root of 1212031421 is about 1066.1982357991.

Adding to 1212031421 its reverse (1241302121), we get a palindrome (2453333542).

The spelling of 1212031421 in words is "one billion, two hundred twelve million, thirty-one thousand, four hundred twenty-one".