1242201220 has 96 divisors (see below), whose sum is σ = 2985873408. Its totient is φ = 430036992.

The previous prime is 1242201151. The next prime is 1242201223. The reversal of 1242201220 is 221022421.

It is a junction number, because it is equal to n+sod(n) for n = 1242201194 and 1242201203.

It is not an unprimeable number, because it can be changed into a prime (1242201223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2046157 + ... + 2046763.

It is an arithmetic number, because the mean of its divisors is an integer number (31102848).

Almost surely, 2^1242201220 is an apocalyptic number.

1242201220 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 1242201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492936704).

1242201220 is an abundant number, since it is smaller than the sum of its proper divisors (1743672188).

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

1242201220 is a wasteful number, since it uses less digits than its factorization.

1242201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1107 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1242201220 is about 35244.8750884437. The cubic root of 1242201220 is about 1074.9724081615.

Adding to 1242201220 its reverse (221022421), we get a palindrome (1463223641).

It can be divided in two parts, 1242201 and 220, that added together give a palindrome (1242421).

The spelling of 1242201220 in words is "one billion, two hundred forty-two million, two hundred one thousand, two hundred twenty".