210001201020021 has 4 divisors (see below), whose sum is σ = 280001601360032. Its totient is φ = 140000800680012.

The previous prime is 210001201020011. The next prime is 210001201020043. The reversal of 210001201020021 is 120020102100012.

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 not a de Polignac number, because 210001201020021 - 2¹¹ = 210001201017973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001201019979 and 210001201020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001201020001) 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, 35000200170001 + ... + 35000200170006.

It is an arithmetic number, because the mean of its divisors is an integer number (70000400340008).

Almost surely, 2^{210001201020021} is an apocalyptic number.

It is an amenable number.

210001201020021 is a deficient number, since it is larger than the sum of its proper divisors (70000400340011).

210001201020021 is an equidigital number, since it uses as much as digits as its factorization.

210001201020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70000400340010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210001201020021 its reverse (120020102100012), we get a palindrome (330021303120033).

The spelling of 210001201020021 in words is "two hundred ten trillion, one billion, two hundred one million, twenty thousand, twenty-one".