21001020001211 has 8 divisors (see below), whose sum is σ = 22176964123920. Its totient is φ = 19832138606592.

The previous prime is 21001020001141. The next prime is 21001020001229. The reversal of 21001020001211 is 11210002010012.

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

It is not a de Polignac number, because 21001020001211 - 2²⁶ = 21000952892347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001020001192 and 21001020001201.

It is not an unprimeable number, because it can be changed into a prime (21001020007211) 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, 1765675910 + ... + 1765687803.

It is an arithmetic number, because the mean of its divisors is an integer number (2772120515490).

Almost surely, 2^{21001020001211} is an apocalyptic number.

21001020001211 is a deficient number, since it is larger than the sum of its proper divisors (1175944122709).

21001020001211 is a wasteful number, since it uses less digits than its factorization.

21001020001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531364045.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001020001211 its reverse (11210002010012), we get a palindrome (32211022011223).

The spelling of 21001020001211 in words is "twenty-one trillion, one billion, twenty million, one thousand, two hundred eleven".