202121000001 has 16 divisors (see below), whose sum is σ = 299456632320. Its totient is φ = 134739182160.

The previous prime is 202120999991. The next prime is 202121000099. The reversal of 202121000001 is 100000121202.

202121000001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-202121000001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (202121000101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246111 + ... + 681771.

It is an arithmetic number, because the mean of its divisors is an integer number (18716039520).

Almost surely, 2^202121000001 is an apocalyptic number.

It is an amenable number.

202121000001 is a deficient number, since it is larger than the sum of its proper divisors (97335632319).

202121000001 is a wasteful number, since it uses less digits than its factorization.

202121000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452853 (or 452847 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 202121000001 its reverse (100000121202), we get a palindrome (302121121203).

The spelling of 202121000001 in words is "two hundred two billion, one hundred twenty-one million, one", and thus it is an aban number.