21201201010111 has 8 divisors (see below), whose sum is σ = 22462993036944. Its totient is φ = 19941038156160.

The previous prime is 21201201010091. The next prime is 21201201010139. The reversal of 21201201010111 is 11101010210212.

It is a happy number.

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

It is not a de Polignac number, because 21201201010111 - 2¹⁹ = 21201200485823 is a prime.

It is a super-2 number, since 2×21201201010111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201201010091 and 21201201010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201201016111) 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, 407266420 + ... + 407318473.

It is an arithmetic number, because the mean of its divisors is an integer number (2807874129618).

Almost surely, 2^{21201201010111} is an apocalyptic number.

21201201010111 is a deficient number, since it is larger than the sum of its proper divisors (1261792026833).

21201201010111 is a wasteful number, since it uses less digits than its factorization.

21201201010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814586441.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201201010111 its reverse (11101010210212), we get a palindrome (32302211220323).

The spelling of 21201201010111 in words is "twenty-one trillion, two hundred one billion, two hundred one million, ten thousand, one hundred eleven".