10000001211220 has 24 divisors (see below), whose sum is σ = 21185843278824. Its totient is φ = 3964602249216.

The previous prime is 10000001211203. The next prime is 10000001211253. The reversal of 10000001211220 is 2211210000001.

It can be written as a sum of positive squares in 4 ways, for example, as 1428995504836 + 8571005706384 = 1195406^2 + 2927628^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 10000001211197 and 10000001211206.

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, 2212387389 + ... + 2212391908.

It is an arithmetic number, because the mean of its divisors is an integer number (882743469951).

Almost surely, 2^{10000001211220} is an apocalyptic number.

10000001211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10000001211220 is an abundant number, since it is smaller than the sum of its proper divisors (11185842067604).

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

10000001211220 is a wasteful number, since it uses less digits than its factorization.

10000001211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424779419 (or 4424779417 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10000001211220 its reverse (2211210000001), we get a palindrome (12211211211221).

The spelling of 10000001211220 in words is "ten trillion, one million, two hundred eleven thousand, two hundred twenty".