1001012212221 has 32 divisors (see below), whose sum is σ = 1538728919040. Its totient is φ = 566998621056.

The previous prime is 1001012212183. The next prime is 1001012212241. The reversal of 1001012212221 is 1222122101001.

It is not a de Polignac number, because 1001012212221 - 2³⁴ = 983832343037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001012212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001012212241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2844820 + ... + 3177266.

It is an arithmetic number, because the mean of its divisors is an integer number (48085278720).

Almost surely, 2^{1001012212221} is an apocalyptic number.

It is an amenable number.

1001012212221 is a deficient number, since it is larger than the sum of its proper divisors (537716706819).

1001012212221 is a wasteful number, since it uses less digits than its factorization.

1001012212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333713.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001012212221 its reverse (1222122101001), we get a palindrome (2223134313222).

The spelling of 1001012212221 in words is "one trillion, one billion, twelve million, two hundred twelve thousand, two hundred twenty-one".