202121100001 has 4 divisors (see below), whose sum is σ = 204010082352. Its totient is φ = 200232117652.

The previous prime is 202121099963. The next prime is 202121100011. The reversal of 202121100001 is 100001121202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202121100001 - 2¹¹ = 202121097953 is a prime.

It is a super-2 number, since 2×202121100001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121100011) 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, 944491015 + ... + 944491228.

It is an arithmetic number, because the mean of its divisors is an integer number (51002520588).

Almost surely, 2^202121100001 is an apocalyptic number.

It is an amenable number.

202121100001 is a deficient number, since it is larger than the sum of its proper divisors (1888982351).

202121100001 is a wasteful number, since it uses less digits than its factorization.

202121100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888982350.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202121100001 its reverse (100001121202), we get a palindrome (302122221203).

The spelling of 202121100001 in words is "two hundred two billion, one hundred twenty-one million, one hundred thousand, one".