210101020220021 has 4 divisors (see below), whose sum is σ = 240115451680032. Its totient is φ = 180086588760012.

The previous prime is 210101020220011. The next prime is 210101020220099. The reversal of 210101020220021 is 120022020101012.

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 210101020220021 - 2⁶ = 210101020219957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210101020219978 and 210101020220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101020220011) 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 3 ways as a sum of consecutive naturals, for example, 15007215729995 + ... + 15007215730008.

It is an arithmetic number, because the mean of its divisors is an integer number (60028862920008).

Almost surely, 2^{210101020220021} is an apocalyptic number.

It is an amenable number.

210101020220021 is a deficient number, since it is larger than the sum of its proper divisors (30014431460011).

210101020220021 is an equidigital number, since it uses as much as digits as its factorization.

210101020220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30014431460010.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210101020220021 its reverse (120022020101012), we get a palindrome (330123040321033).

The spelling of 210101020220021 in words is "two hundred ten trillion, one hundred one billion, twenty million, two hundred twenty thousand, twenty-one".