1242100000 has 72 divisors (see below), whose sum is σ = 3056780916. Its totient is φ = 496800000.

The previous prime is 1242099979. The next prime is 1242100007. The reversal of 1242100000 is 12421.

It can be written as a sum of positive squares in 6 ways, for example, as 3341584 + 1238758416 = 1828^2 + 35196^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 1242100000.

It is not an unprimeable number, because it can be changed into a prime (1242100007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93790 + ... + 106210.

Almost surely, 2^1242100000 is an apocalyptic number.

1242100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1528390458).

1242100000 is an abundant number, since it is smaller than the sum of its proper divisors (1814680916).

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

1242100000 is an frugal number, since it uses more digits than its factorization.

1242100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12456 (or 12428 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1242100000 is about 35243.4391057400. The cubic root of 1242100000 is about 1074.9432095472.

Adding to 1242100000 its reverse (12421), we get a palindrome (1242112421).

1242100000 divided by its reverse (12421) gives a 5-th power (100000 = 10⁵).

The spelling of 1242100000 in words is "one billion, two hundred forty-two million, one hundred thousand".