1212144021 has 56 divisors (see below), whose sum is σ = 2011469760. Its totient is φ = 723945600.

The previous prime is 1212143981. The next prime is 1212144029. The reversal of 1212144021 is 1204412121.

It is not a de Polignac number, because 1212144021 - 2¹³ = 1212135829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212143985 and 1212144003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212144029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 568285 + ... + 570413.

Almost surely, 2^1212144021 is an apocalyptic number.

1212144021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212144021 is a deficient number, since it is larger than the sum of its proper divisors (799325739).

1212144021 is an equidigital number, since it uses as much as digits as its factorization.

1212144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1212144021 is about 34815.8587571813. The cubic root of 1212144021 is about 1066.2312520509.

Adding to 1212144021 its reverse (1204412121), we get a palindrome (2416556142).

The spelling of 1212144021 in words is "one billion, two hundred twelve million, one hundred forty-four thousand, twenty-one".