21021021212001 has 8 divisors (see below), whose sum is σ = 28248721419264. Its totient is φ = 13903667573040.

The previous prime is 21021021211961. The next prime is 21021021212011. The reversal of 21021021212001 is 10021212012012.

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

It is not a de Polignac number, because 21021021212001 - 2⁶ = 21021021211937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021021212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27586641630 + ... + 27586642391.

It is an arithmetic number, because the mean of its divisors is an integer number (3531090177408).

Almost surely, 2^{21021021212001} is an apocalyptic number.

It is an amenable number.

21021021212001 is a deficient number, since it is larger than the sum of its proper divisors (7227700207263).

21021021212001 is a wasteful number, since it uses less digits than its factorization.

21021021212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55173284151.

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

Adding to 21021021212001 its reverse (10021212012012), we get a palindrome (31042233224013).

The spelling of 21021021212001 in words is "twenty-one trillion, twenty-one billion, twenty-one million, two hundred twelve thousand, one".