1212212420 has 24 divisors (see below), whose sum is σ = 2548241304. Its totient is φ = 484390656.

The previous prime is 1212212413. The next prime is 1212212429. The reversal of 1212212420 is 242122121.

It can be written as a sum of positive squares in 4 ways, for example, as 428324416 + 783888004 = 20696^2 + 27998^2 .

It is not an unprimeable number, because it can be changed into a prime (1212212429) 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, 10457 + ... + 50336.

It is an arithmetic number, because the mean of its divisors is an integer number (106176721).

Almost surely, 2^1212212420 is an apocalyptic number.

1212212420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212212420 is an abundant number, since it is smaller than the sum of its proper divisors (1336028884).

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

1212212420 is a wasteful number, since it uses less digits than its factorization.

1212212420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61799 (or 61797 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1212212420 is about 34816.8410399335. The cubic root of 1212212420 is about 1066.2513068129.

Adding to 1212212420 its reverse (242122121), we get a palindrome (1454334541).

It can be divided in two parts, 12122 and 12420, that added together give a palindrome (24542).

The spelling of 1212212420 in words is "one billion, two hundred twelve million, two hundred twelve thousand, four hundred twenty".