212121011001021 has 8 divisors (see below), whose sum is σ = 282828094543104. Its totient is φ = 141413967396480.

The previous prime is 212121011001001. The next prime is 212121011001049. The reversal of 212121011001021 is 120100110121212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212121011001021 - 2⁶ = 212121011000957 is a prime.

It is a super-3 number, since 3×212121011001021³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121011001001) 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, 6119085 + ... + 21486861.

It is an arithmetic number, because the mean of its divisors is an integer number (35353511817888).

Almost surely, 2^{212121011001021} is an apocalyptic number.

It is an amenable number.

212121011001021 is a deficient number, since it is larger than the sum of its proper divisors (70707083542083).

212121011001021 is a wasteful number, since it uses less digits than its factorization.

212121011001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19968771.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212121011001021 its reverse (120100110121212), we get a palindrome (332221121122233).

The spelling of 212121011001021 in words is "two hundred twelve trillion, one hundred twenty-one billion, eleven million, one thousand, twenty-one".