202121001212020 has 36 divisors (see below), whose sum is σ = 466548724290852. Its totient is φ = 73498545894400.

The previous prime is 202121001212003. The next prime is 202121001212023. The reversal of 202121001212020 is 20212100121202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33447507357924 + 168673493854096 = 5783382^2 + 12987436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202121001211985 and 202121001212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121001212023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41760535021 + ... + 41760539860.

It is an arithmetic number, because the mean of its divisors is an integer number (12959686785857).

Almost surely, 2^{202121001212020} is an apocalyptic number.

202121001212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121001212020 is an abundant number, since it is smaller than the sum of its proper divisors (264427723078832).

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

202121001212020 is a wasteful number, since it uses less digits than its factorization.

202121001212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83521074912 (or 83521074899 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202121001212020 its reverse (20212100121202), we get a palindrome (222333101333222).

The spelling of 202121001212020 in words is "two hundred two trillion, one hundred twenty-one billion, one million, two hundred twelve thousand, twenty".