1212042421 has 8 divisors (see below), whose sum is σ = 1291840704. Its totient is φ = 1133188800.

The previous prime is 1212042401. The next prime is 1212042463. The reversal of 1212042421 is 1242402121.

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 1212042421 - 2⁵ = 1212042389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212042401) 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, 233515 + ... + 238648.

It is an arithmetic number, because the mean of its divisors is an integer number (161480088).

Almost surely, 2^1212042421 is an apocalyptic number.

It is an amenable number.

1212042421 is a deficient number, since it is larger than the sum of its proper divisors (79798283).

1212042421 is a wasteful number, since it uses less digits than its factorization.

1212042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472331.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1212042421 is about 34814.3996214210. The cubic root of 1212042421 is about 1066.2014612779.

Adding to 1212042421 its reverse (1242402121), we get a palindrome (2454444542).

The spelling of 1212042421 in words is "one billion, two hundred twelve million, forty-two thousand, four hundred twenty-one".