21210212120001 has 8 divisors (see below), whose sum is σ = 28280304101760. Its totient is φ = 14140130775792.

The previous prime is 21210212119997. The next prime is 21210212120023. The reversal of 21210212120001 is 10002121201212.

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

It is not a de Polignac number, because 21210212120001 - 2² = 21210212119997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210212120051) 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, 6481960 + ... + 9188918.

It is an arithmetic number, because the mean of its divisors is an integer number (3535038012720).

Almost surely, 2^{21210212120001} is an apocalyptic number.

It is an amenable number.

21210212120001 is a deficient number, since it is larger than the sum of its proper divisors (7070091981759).

21210212120001 is a wasteful number, since it uses less digits than its factorization.

21210212120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318775.

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

Adding to 21210212120001 its reverse (10002121201212), we get a palindrome (31212333321213).

The spelling of 21210212120001 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred twenty thousand, one".