21211110200121 has 16 divisors (see below), whose sum is σ = 31521154478400. Its totient is φ = 12608461790208.

The previous prime is 21211110200047. The next prime is 21211110200131. The reversal of 21211110200121 is 12100201111212.

It is a happy number.

It is not a de Polignac number, because 21211110200121 - 2¹⁵ = 21211110167353 is a prime.

It is a super-2 number, since 2×21211110200121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21211110200121.

It is not an unprimeable number, because it can be changed into a prime (21211110200131) 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, 10944844336 + ... + 10944846273.

It is an arithmetic number, because the mean of its divisors is an integer number (1970072154900).

Almost surely, 2^{21211110200121} is an apocalyptic number.

It is an amenable number.

21211110200121 is a deficient number, since it is larger than the sum of its proper divisors (10310044278279).

21211110200121 is a wasteful number, since it uses less digits than its factorization.

21211110200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21889690648.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21211110200121 its reverse (12100201111212), we get a palindrome (33311311311333).

The spelling of 21211110200121 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, two hundred thousand, one hundred twenty-one".