210021210021121 has 4 divisors (see below), whose sum is σ = 210021241796352. Its totient is φ = 210021178245892.

The previous prime is 210021210021053. The next prime is 210021210021151. The reversal of 210021210021121 is 121120012120012.

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 210021210021121 - 2³⁵ = 209986850282753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021210021095 and 210021210021104.

It is not an unprimeable number, because it can be changed into a prime (210021210021151) 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, 1822921 + ... + 20575846.

It is an arithmetic number, because the mean of its divisors is an integer number (52505310449088).

Almost surely, 2^{210021210021121} is an apocalyptic number.

It is an amenable number.

210021210021121 is a deficient number, since it is larger than the sum of its proper divisors (31775231).

210021210021121 is an equidigital number, since it uses as much as digits as its factorization.

210021210021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31775230.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210021210021121 its reverse (121120012120012), we get a palindrome (331141222141133).

The spelling of 210021210021121 in words is "two hundred ten trillion, twenty-one billion, two hundred ten million, twenty-one thousand, one hundred twenty-one".