1212422420 has 36 divisors (see below), whose sum is σ = 2798597172. Its totient is φ = 440880000.

The previous prime is 1212422413. The next prime is 1212422443. The reversal of 1212422420 is 242242121.

It can be written as a sum of positive squares in 2 ways, for example, as 121969936 + 1090452484 = 11044^2 + 33022^2 .

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212422392 and 1212422401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248081 + ... + 252920.

Almost surely, 2^1212422420 is an apocalyptic number.

1212422420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212422420 is an abundant number, since it is smaller than the sum of its proper divisors (1586174752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212422420 is a wasteful number, since it uses less digits than its factorization.

1212422420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501032 (or 501019 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1212422420 is about 34819.8566912617. The cubic root of 1212422420 is about 1066.3128746377.

Adding to 1212422420 its reverse (242242121), we get a palindrome (1454664541).

The spelling of 1212422420 in words is "one billion, two hundred twelve million, four hundred twenty-two thousand, four hundred twenty".