1002021221021 has 4 divisors (see below), whose sum is σ = 1002563735712. Its totient is φ = 1001478706332.

The previous prime is 1002021220997. The next prime is 1002021221023. The reversal of 1002021221021 is 1201221202001.

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 1002021221021 - 2⁶ = 1002021220957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002021220987 and 1002021221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002021221023) 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, 271254575 + ... + 271258268.

It is an arithmetic number, because the mean of its divisors is an integer number (250640933928).

Almost surely, 2^{1002021221021} is an apocalyptic number.

It is an amenable number.

1002021221021 is a deficient number, since it is larger than the sum of its proper divisors (542514691).

1002021221021 is an equidigital number, since it uses as much as digits as its factorization.

1002021221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542514690.

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

Adding to 1002021221021 its reverse (1201221202001), we get a palindrome (2203242423022).

The spelling of 1002021221021 in words is "one trillion, two billion, twenty-one million, two hundred twenty-one thousand, twenty-one".