2201211221020 has 72 divisors (see below), whose sum is σ = 5383336415184. Its totient is φ = 753845992704.

The previous prime is 2201211220993. The next prime is 2201211221023. The reversal of 2201211221020 is 201221121022.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2201211220985 and 2201211221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201211221023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406537 + ... + 2137216.

It is an arithmetic number, because the mean of its divisors is an integer number (74768561322).

Almost surely, 2^{2201211221020} is an apocalyptic number.

2201211221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2201211221020 is an abundant number, since it is smaller than the sum of its proper divisors (3182125194164).

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

2201211221020 is a wasteful number, since it uses less digits than its factorization.

2201211221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544659 (or 2544650 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2201211221020 its reverse (201221121022), we get a palindrome (2402432342042).

The spelling of 2201211221020 in words is "two trillion, two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, twenty".