1002021221020 has 24 divisors (see below), whose sum is σ = 2104273062864. Its totient is φ = 400803060096.

The previous prime is 1002021220997. The next prime is 1002021221023. The reversal of 1002021221020 is 201221202001.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1389147 + ... + 1983373.

It is an arithmetic number, because the mean of its divisors is an integer number (87678044286).

Almost surely, 2^{1002021221020} is an apocalyptic number.

1002021221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1002021221020 is an abundant number, since it is smaller than the sum of its proper divisors (1102251841844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1002021221020 is a wasteful number, since it uses less digits than its factorization.

1002021221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678549 (or 678547 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1002021221020 its reverse (201221202001), we get a palindrome (1203242423021).

The spelling of 1002021221020 in words is "one trillion, two billion, twenty-one million, two hundred twenty-one thousand, twenty".