210001120021 has 8 divisors (see below), whose sum is σ = 261819578304. Its totient is φ = 163637236320.

The previous prime is 210001120019. The next prime is 210001120027. The reversal of 210001120021 is 120021100012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210001120021 - 2¹ = 210001120019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363643560 + ... + 1363643713.

It is an arithmetic number, because the mean of its divisors is an integer number (32727447288).

Almost surely, 2^210001120021 is an apocalyptic number.

It is an amenable number.

210001120021 is a deficient number, since it is larger than the sum of its proper divisors (51818458283).

210001120021 is a wasteful number, since it uses less digits than its factorization.

210001120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727287291.

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

Adding to 210001120021 its reverse (120021100012), we get a palindrome (330022220033).

The spelling of 210001120021 in words is "two hundred ten billion, one million, one hundred twenty thousand, twenty-one".