1001122221021 has 16 divisors (see below), whose sum is σ = 1522068174144. Its totient is φ = 579835494144.

The previous prime is 1001122221019. The next prime is 1001122221023. The reversal of 1001122221021 is 1201222211001.

It is an interprime number because it is at equal distance from previous prime (1001122221019) and next prime (1001122221023).

It is not a de Polignac number, because 1001122221021 - 2¹ = 1001122221019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001122221023) 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, 754993471 + ... + 754994796.

It is an arithmetic number, because the mean of its divisors is an integer number (95129260884).

Almost surely, 2^{1001122221021} is an apocalyptic number.

It is an amenable number.

1001122221021 is a deficient number, since it is larger than the sum of its proper divisors (520945953123).

1001122221021 is a wasteful number, since it uses less digits than its factorization.

1001122221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509988300.

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

Adding to 1001122221021 its reverse (1201222211001), we get a palindrome (2202344432022).

The spelling of 1001122221021 in words is "one trillion, one billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".