1242221140 has 48 divisors (see below), whose sum is σ = 2751134400. Its totient is φ = 469850112.

The previous prime is 1242221111. The next prime is 1242221153. The reversal of 1242221140 is 411222421.

It is a super-2 number, since 2×1242221140² = 3086226721325799200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220276 + ... + 225844.

It is an arithmetic number, because the mean of its divisors is an integer number (57315300).

Almost surely, 2^1242221140 is an apocalyptic number.

1242221140 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 1242221140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375567200).

1242221140 is an abundant number, since it is smaller than the sum of its proper divisors (1508913260).

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

1242221140 is a wasteful number, since it uses less digits than its factorization.

1242221140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6184 (or 6182 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1242221140 is about 35245.1576815880. The cubic root of 1242221140 is about 1074.9781542343.

Adding to 1242221140 its reverse (411222421), we get a palindrome (1653443561).

The spelling of 1242221140 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, one hundred forty".