1200001020221 has 4 divisors (see below), whose sum is σ = 1202194806912. Its totient is φ = 1197807233532.

The previous prime is 1200001020217. The next prime is 1200001020233. The reversal of 1200001020221 is 1220201000021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200001020221 - 2² = 1200001020217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001620221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096892525 + ... + 1096893618.

It is an arithmetic number, because the mean of its divisors is an integer number (300548701728).

Almost surely, 2^{1200001020221} is an apocalyptic number.

It is an amenable number.

1200001020221 is a deficient number, since it is larger than the sum of its proper divisors (2193786691).

1200001020221 is an equidigital number, since it uses as much as digits as its factorization.

1200001020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193786690.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1200001020221 its reverse (1220201000021), we get a palindrome (2420202020242).

The spelling of 1200001020221 in words is "one trillion, two hundred billion, one million, twenty thousand, two hundred twenty-one".