1242021210 has 64 divisors (see below), whose sum is σ = 3053635200. Its totient is φ = 323212032.

The previous prime is 1242021167. The next prime is 1242021269. The reversal of 1242021210 is 121202421.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1242021210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216256 + ... + 221924.

It is an arithmetic number, because the mean of its divisors is an integer number (47713050).

Almost surely, 2^1242021210 is an apocalyptic number.

1242021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242021210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526817600).

1242021210 is an abundant number, since it is smaller than the sum of its proper divisors (1811613990).

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

1242021210 is a wasteful number, since it uses less digits than its factorization.

1242021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1242021210 is about 35242.3212913111. The cubic root of 1242021210 is about 1074.9204801464.

Adding to 1242021210 its reverse (121202421), we get a palindrome (1363223631).

The spelling of 1242021210 in words is "one billion, two hundred forty-two million, twenty-one thousand, two hundred ten".