102020012021 has 24 divisors (see below), whose sum is σ = 106386748104. Its totient is φ = 97826641920.

The previous prime is 102020011969. The next prime is 102020012089. The reversal of 102020012021 is 120210020201.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 8849164900 + 93170847121 = 94070^2 + 305239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102020012021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102020011993 and 102020012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020012921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102326495 + ... + 102327491.

It is an arithmetic number, because the mean of its divisors is an integer number (4432781171).

Almost surely, 2^102020012021 is an apocalyptic number.

It is an amenable number.

102020012021 is a deficient number, since it is larger than the sum of its proper divisors (4366736083).

102020012021 is an equidigital number, since it uses as much as digits as its factorization.

102020012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102020012021 its reverse (120210020201), we get a palindrome (222230032222).

The spelling of 102020012021 in words is "one hundred two billion, twenty million, twelve thousand, twenty-one".