1321020123210 has 40 divisors (see below), whose sum is σ = 3552076333476. Its totient is φ = 352272032640.

The previous prime is 1321020123209. The next prime is 1321020123257. The reversal of 1321020123210 is 123210201231.

1321020123210 is a `hidden beast` number, since 1 + 321 + 0 + 20 + 1 + 2 + 321 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1166030669241 + 154989453969 = 1079829^2 + 393687^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 815443711 + ... + 815445330.

Almost surely, 2^{1321020123210} is an apocalyptic number.

1321020123210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321020123210 is an abundant number, since it is smaller than the sum of its proper divisors (2231056210266).

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

1321020123210 is a wasteful number, since it uses less digits than its factorization.

1321020123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630889060 (or 1630889051 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321020123210 its reverse (123210201231), we get a palindrome (1444230324441).

The spelling of 1321020123210 in words is "one trillion, three hundred twenty-one billion, twenty million, one hundred twenty-three thousand, two hundred ten".