121010101020021 has 4 divisors (see below), whose sum is σ = 161346801360032. Its totient is φ = 80673400680012.

The previous prime is 121010101020013. The next prime is 121010101020037. The reversal of 121010101020021 is 120020101010121.

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 121010101020021 - 2³ = 121010101020013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121010101019979 and 121010101020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010101020421) 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, 20168350170001 + ... + 20168350170006.

It is an arithmetic number, because the mean of its divisors is an integer number (40336700340008).

Almost surely, 2^{121010101020021} is an apocalyptic number.

It is an amenable number.

121010101020021 is a deficient number, since it is larger than the sum of its proper divisors (40336700340011).

121010101020021 is an equidigital number, since it uses as much as digits as its factorization.

121010101020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40336700340010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121010101020021 its reverse (120020101010121), we get a palindrome (241030202030142).

The spelling of 121010101020021 in words is "one hundred twenty-one trillion, ten billion, one hundred one million, twenty thousand, twenty-one".