1203121220 has 96 divisors (see below), whose sum is σ = 2973680640. Its totient is φ = 400296960.

The previous prime is 1203121201. The next prime is 1203121223. The reversal of 1203121220 is 221213021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1203121195 and 1203121204.

It is not an unprimeable number, because it can be changed into a prime (1203121223) 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, 1371422 + ... + 1372298.

It is an arithmetic number, because the mean of its divisors is an integer number (30975840).

Almost surely, 2^1203121220 is an apocalyptic number.

1203121220 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 1203121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486840320).

1203121220 is an abundant number, since it is smaller than the sum of its proper divisors (1770559420).

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

1203121220 is a wasteful number, since it uses less digits than its factorization.

1203121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1203121220 is about 34686.0378250385. The cubic root of 1203121220 is about 1063.5791024190.

Adding to 1203121220 its reverse (221213021), we get a palindrome (1424334241).

The spelling of 1203121220 in words is "one billion, two hundred three million, one hundred twenty-one thousand, two hundred twenty".