1002020221121 has 4 divisors (see below), whose sum is σ = 1002176135472. Its totient is φ = 1001864306772.

The previous prime is 1002020221117. The next prime is 1002020221141. The reversal of 1002020221121 is 1211220202001.

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 1002020221121 - 2² = 1002020221117 is a prime.

It is a super-3 number, since 3×1002020221121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002020221096 and 1002020221105.

It is not an unprimeable number, because it can be changed into a prime (1002020221141) 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, 77947535 + ... + 77960388.

It is an arithmetic number, because the mean of its divisors is an integer number (250544033868).

Almost surely, 2^{1002020221121} is an apocalyptic number.

It is an amenable number.

1002020221121 is a deficient number, since it is larger than the sum of its proper divisors (155914351).

1002020221121 is an equidigital number, since it uses as much as digits as its factorization.

1002020221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155914350.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1002020221121 its reverse (1211220202001), we get a palindrome (2213240423122).

The spelling of 1002020221121 in words is "one trillion, two billion, twenty million, two hundred twenty-one thousand, one hundred twenty-one".