21210101212001 has 8 divisors (see below), whose sum is σ = 22893208746240. Its totient is φ = 19534359575952.

The previous prime is 21210101211953. The next prime is 21210101212009. The reversal of 21210101212001 is 10021210101212.

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

It is not a de Polignac number, because 21210101212001 - 2¹⁸ = 21210100949857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210101212009) 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, 1841468561 + ... + 1841480078.

It is an arithmetic number, because the mean of its divisors is an integer number (2861651093280).

Almost surely, 2^{21210101212001} is an apocalyptic number.

It is an amenable number.

21210101212001 is a deficient number, since it is larger than the sum of its proper divisors (1683107534239).

21210101212001 is a wasteful number, since it uses less digits than its factorization.

21210101212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682949095.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210101212001 its reverse (10021210101212), we get a palindrome (31231311313213).

The spelling of 21210101212001 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, two hundred twelve thousand, one".