1331212020 has 96 divisors (see below), whose sum is σ = 3818078208. Its totient is φ = 346399872.

The previous prime is 1331212007. The next prime is 1331212021. The reversal of 1331212020 is 202121331.

It is a super-3 number, since 3×1331212020³ (a number of 28 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331212021) 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, 1542109 + ... + 1542971.

It is an arithmetic number, because the mean of its divisors is an integer number (39771648).

Almost surely, 2^1331212020 is an apocalyptic number.

1331212020 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 1331212020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909039104).

1331212020 is an abundant number, since it is smaller than the sum of its proper divisors (2486866188).

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

1331212020 is a wasteful number, since it uses less digits than its factorization.

1331212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1467 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331212020 is about 36485.7783252598. The cubic root of 1331212020 is about 1100.0584046124.

Adding to 1331212020 its reverse (202121331), we get a palindrome (1533333351).

The spelling of 1331212020 in words is "one billion, three hundred thirty-one million, two hundred twelve thousand, twenty".