1242205100 has 18 divisors (see below), whose sum is σ = 2695585284. Its totient is φ = 496882000.

The previous prime is 1242205099. The next prime is 1242205127. The reversal of 1242205100 is 15022421.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6210926 + ... + 6211125.

It is an arithmetic number, because the mean of its divisors is an integer number (149754738).

Almost surely, 2^1242205100 is an apocalyptic number.

1242205100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242205100 is an abundant number, since it is smaller than the sum of its proper divisors (1453380184).

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

1242205100 is a wasteful number, since it uses less digits than its factorization.

1242205100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12422065 (or 12422058 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1242205100 is about 35244.9301318644. The cubic root of 1242205100 is about 1074.9735273813.

Adding to 1242205100 its reverse (15022421), we get a palindrome (1257227521).

The spelling of 1242205100 in words is "one billion, two hundred forty-two million, two hundred five thousand, one hundred".