1321020010 has 16 divisors (see below), whose sum is σ = 2380348296. Its totient is φ = 527849728.

The previous prime is 1321019963. The next prime is 1321020013. The reversal of 1321020010 is 100201231.

It can be written as a sum of positive squares in 4 ways, for example, as 1111088889 + 209931121 = 33333^2 + 14489^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1321020013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59779 + ... + 78838.

Almost surely, 2^1321020010 is an apocalyptic number.

1321020010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321020010 is a deficient number, since it is larger than the sum of its proper divisors (1059328286).

1321020010 is a wasteful number, since it uses less digits than its factorization.

1321020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139577.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1321020010 is about 36345.8389640410. The cubic root of 1321020010 is about 1097.2437911488.

Adding to 1321020010 its reverse (100201231), we get a palindrome (1421221241).

The spelling of 1321020010 in words is "one billion, three hundred twenty-one million, twenty thousand, ten".