1200000010221 has 28 divisors (see below), whose sum is σ = 1815099014748. Its totient is φ = 792920306304.

The previous prime is 1200000010189. The next prime is 1200000010229. The reversal of 1200000010221 is 1220100000021.

It can be written as a sum of positive squares in 2 ways, for example, as 18094016196 + 1181905994025 = 134514^2 + 1087155^2 .

It is not a de Polignac number, because 1200000010221 - 2⁵ = 1200000010189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200000010229) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7201210 + ... + 7365963.

Almost surely, 2^{1200000010221} is an apocalyptic number.

It is an amenable number.

1200000010221 is a deficient number, since it is larger than the sum of its proper divisors (615099004527).

1200000010221 is an equidigital number, since it uses as much as digits as its factorization.

1200000010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14567304 (or 14567289 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200000010221 its reverse (1220100000021), we get a palindrome (2420100010242).

The spelling of 1200000010221 in words is "one trillion, two hundred billion, ten thousand, two hundred twenty-one".