10002001220 has 24 divisors (see below), whose sum is σ = 21006979224. Its totient is φ = 4000271616.

The previous prime is 10002001181. The next prime is 10002001253. The reversal of 10002001220 is 2210020001.

It can be written as a sum of positive squares in 4 ways, for example, as 1108756804 + 8893244416 = 33298^2 + 94304^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10002001198 and 10002001207.

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, 145562 + ... + 202958.

It is an arithmetic number, because the mean of its divisors is an integer number (875290801).

Almost surely, 2^10002001220 is an apocalyptic number.

10002001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10002001220 is an abundant number, since it is smaller than the sum of its proper divisors (11004978004).

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

10002001220 is a wasteful number, since it uses less digits than its factorization.

10002001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66119 (or 66117 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 10002001220 its reverse (2210020001), we get a palindrome (12212021221).

The spelling of 10002001220 in words is "ten billion, two million, one thousand, two hundred twenty".