21211101101201 has 4 divisors (see below), whose sum is σ = 23139383019504. Its totient is φ = 19282819182900.

The previous prime is 21211101101191. The next prime is 21211101101221. The reversal of 21211101101201 is 10210110111212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21211101101201 - 2⁶ = 21211101101137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211101101221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964140959135 + ... + 964140959156.

It is an arithmetic number, because the mean of its divisors is an integer number (5784845754876).

Almost surely, 2^{21211101101201} is an apocalyptic number.

It is an amenable number.

21211101101201 is a deficient number, since it is larger than the sum of its proper divisors (1928281918303).

21211101101201 is a wasteful number, since it uses less digits than its factorization.

21211101101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928281918302.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21211101101201 its reverse (10210110111212), we get a palindrome (31421211212413).

The spelling of 21211101101201 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, one hundred one thousand, two hundred one".