1331421020 has 24 divisors (see below), whose sum is σ = 2804445168. Its totient is φ = 530956800.

The previous prime is 1331420999. The next prime is 1331421037. The reversal of 1331421020 is 201241331.

It is a self number, because there is not a number n which added to its sum of digits gives 1331421020.

It is a congruent number.

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, 93941 + ... + 107180.

It is an arithmetic number, because the mean of its divisors is an integer number (116851882).

Almost surely, 2^1331421020 is an apocalyptic number.

1331421020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331421020 is an abundant number, since it is smaller than the sum of its proper divisors (1473024148).

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

1331421020 is a wasteful number, since it uses less digits than its factorization.

1331421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201461 (or 201459 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1331421020 is about 36488.6423425153. The cubic root of 1331421020 is about 1100.1159712440.

Adding to 1331421020 its reverse (201241331), we get a palindrome (1532662351).

The spelling of 1331421020 in words is "one billion, three hundred thirty-one million, four hundred twenty-one thousand, twenty".