212121010121 has 8 divisors (see below), whose sum is σ = 219203111424. Its totient is φ = 205136593200.

The previous prime is 212121010043. The next prime is 212121010133. The reversal of 212121010121 is 121010121212.

212121010121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 212121010121 - 2¹⁸ = 212120747977 is a prime.

It is a super-3 number, since 3×212121010121³ (a number of 35 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121010096 and 212121010105.

It is not an unprimeable number, because it can be changed into a prime (212121610121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24416681 + ... + 24425366.

It is an arithmetic number, because the mean of its divisors is an integer number (27400388928).

Almost surely, 2^212121010121 is an apocalyptic number.

It is an amenable number.

212121010121 is a deficient number, since it is larger than the sum of its proper divisors (7082101303).

212121010121 is a wasteful number, since it uses less digits than its factorization.

212121010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48842191.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212121010121 its reverse (121010121212), we get a palindrome (333131131333).

It can be divided in two parts, 212 and 121010121, that multiplied together give a palindrome (25654145652).

The spelling of 212121010121 in words is "two hundred twelve billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".