21100021211211 has 16 divisors (see below), whose sum is σ = 30031164368640. Its totient is φ = 13138634406240.

The previous prime is 21100021211149. The next prime is 21100021211231. The reversal of 21100021211211 is 11211212000112.

It is a happy number.

It is not a de Polignac number, because 21100021211211 - 2¹⁴ = 21100021194827 is a prime.

It is a super-2 number, since 2×21100021211211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100021211231) 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, 2606867860 + ... + 2606875953.

It is an arithmetic number, because the mean of its divisors is an integer number (1876947773040).

Almost surely, 2^{21100021211211} is an apocalyptic number.

21100021211211 is a deficient number, since it is larger than the sum of its proper divisors (8931143157429).

21100021211211 is a wasteful number, since it uses less digits than its factorization.

21100021211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213743906.

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

Adding to 21100021211211 its reverse (11211212000112), we get a palindrome (32311233211323).

The spelling of 21100021211211 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred eleven thousand, two hundred eleven".