1331202220 has 24 divisors (see below), whose sum is σ = 2823207408. Its totient is φ = 527208000.

The previous prime is 1331202209. The next prime is 1331202247. The reversal of 1331202220 is 222021331.

It is a junction number, because it is equal to n+sod(n) for n = 1331202194 and 1331202203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327486 + ... + 331525.

It is an arithmetic number, because the mean of its divisors is an integer number (117633642).

Almost surely, 2^1331202220 is an apocalyptic number.

1331202220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331202220 is an abundant number, since it is smaller than the sum of its proper divisors (1492005188).

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

1331202220 is a wasteful number, since it uses less digits than its factorization.

1331202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659121 (or 659119 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1331202220 is about 36485.6440261098. The cubic root of 1331202220 is about 1100.0557051680.

Adding to 1331202220 its reverse (222021331), we get a palindrome (1553223551).

The spelling of 1331202220 in words is "one billion, three hundred thirty-one million, two hundred two thousand, two hundred twenty".