102021001220020 has 12 divisors (see below), whose sum is σ = 214244102562084. Its totient is φ = 40808400488000.

The previous prime is 102021001219999. The next prime is 102021001220027. The reversal of 102021001220020 is 20022100120201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77536971138064 + 24484030081956 = 8805508^2 + 4948134^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021001220027) 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, 2550525030481 + ... + 2550525030520.

It is an arithmetic number, because the mean of its divisors is an integer number (17853675213507).

Almost surely, 2^{102021001220020} is an apocalyptic number.

102021001220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021001220020 is an abundant number, since it is smaller than the sum of its proper divisors (112223101342064).

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

102021001220020 is a wasteful number, since it uses less digits than its factorization.

102021001220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101050061010 (or 5101050061008 counting only the distinct ones).

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

Adding to 102021001220020 its reverse (20022100120201), we get a palindrome (122043101340221).

The spelling of 102021001220020 in words is "one hundred two trillion, twenty-one billion, one million, two hundred twenty thousand, twenty".