21212001012021 has 8 divisors (see below), whose sum is σ = 29946354369984. Its totient is φ = 13309490831040.

The previous prime is 21212001011983. The next prime is 21212001012071. The reversal of 21212001012021 is 12021010021212.

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

It is not a de Polignac number, because 21212001012021 - 2³⁵ = 21177641273653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212001012071) 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, 207960794185 + ... + 207960794286.

It is an arithmetic number, because the mean of its divisors is an integer number (3743294296248).

Almost surely, 2^{21212001012021} is an apocalyptic number.

It is an amenable number.

21212001012021 is a deficient number, since it is larger than the sum of its proper divisors (8734353357963).

21212001012021 is a wasteful number, since it uses less digits than its factorization.

21212001012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415921588491.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212001012021 its reverse (12021010021212), we get a palindrome (33233011033233).

The spelling of 21212001012021 in words is "twenty-one trillion, two hundred twelve billion, one million, twelve thousand, twenty-one".