21212010122021 has 8 divisors (see below), whose sum is σ = 21326083153920. Its totient is φ = 21097980041472.

The previous prime is 21212010121999. The next prime is 21212010122029. The reversal of 21212010122021 is 12022101021212.

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 21212010122021 - 2¹⁰ = 21212010120997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212010122029) 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, 9747215 + ... + 11723148.

It is an arithmetic number, because the mean of its divisors is an integer number (2665760394240).

Almost surely, 2^{21212010122021} is an apocalyptic number.

It is an amenable number.

21212010122021 is a deficient number, since it is larger than the sum of its proper divisors (114073031899).

21212010122021 is a wasteful number, since it uses less digits than its factorization.

21212010122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21475675.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212010122021 its reverse (12022101021212), we get a palindrome (33234111143233).

The spelling of 21212010122021 in words is "twenty-one trillion, two hundred twelve billion, ten million, one hundred twenty-two thousand, twenty-one".