1001002012221 has 16 divisors (see below), whose sum is σ = 1382626165248. Its totient is φ = 643509484800.

The previous prime is 1001002012217. The next prime is 1001002012267. The reversal of 1001002012221 is 1222102001001.

1001002012221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001002012221 - 2² = 1001002012217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001002012197 and 1001002012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001002012291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19125936 + ... + 19178201.

It is an arithmetic number, because the mean of its divisors is an integer number (86414135328).

Almost surely, 2^{1001002012221} is an apocalyptic number.

It is an amenable number.

1001002012221 is a deficient number, since it is larger than the sum of its proper divisors (381624153027).

1001002012221 is a wasteful number, since it uses less digits than its factorization.

1001002012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38304452.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001002012221 its reverse (1222102001001), we get a palindrome (2223104013222).

The spelling of 1001002012221 in words is "one trillion, one billion, two million, twelve thousand, two hundred twenty-one".