1001022101221 has 8 divisors (see below), whose sum is σ = 1079903976984. Its totient is φ = 924362250240.

The previous prime is 1001022101201. The next prime is 1001022101251. The reversal of 1001022101221 is 1221012201001.

It can be written as a sum of positive squares in 4 ways, for example, as 602930508196 + 398091593025 = 776486^2 + 630945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001022101221 - 2²¹ = 1001020004069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001022101201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555505260 + ... + 555507061.

It is an arithmetic number, because the mean of its divisors is an integer number (134987997123).

Almost surely, 2^{1001022101221} is an apocalyptic number.

It is an amenable number.

1001022101221 is a deficient number, since it is larger than the sum of its proper divisors (78881875763).

1001022101221 is a wasteful number, since it uses less digits than its factorization.

1001022101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111012391.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001022101221 its reverse (1221012201001), we get a palindrome (2222034302222).

The spelling of 1001022101221 in words is "one trillion, one billion, twenty-two million, one hundred one thousand, two hundred twenty-one".