21210021110001 has 16 divisors (see below), whose sum is σ = 28498185031680. Its totient is φ = 14031343402320.

The previous prime is 21210021109999. The next prime is 21210021110021. The reversal of 21210021110001 is 10001112001212.

It is not a de Polignac number, because 21210021110001 - 2¹ = 21210021109999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210021110021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50763111 + ... + 51179228.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136564480).

Almost surely, 2^{21210021110001} is an apocalyptic number.

It is an amenable number.

21210021110001 is a deficient number, since it is larger than the sum of its proper divisors (7288163921679).

21210021110001 is a wasteful number, since it uses less digits than its factorization.

21210021110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101942876.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210021110001 its reverse (10001112001212), we get a palindrome (31211133111213).

The spelling of 21210021110001 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, one hundred ten thousand, one".