21100211221004 has 12 divisors (see below), whose sum is σ = 37306043551224. Its totient is φ = 10441341634944.

The previous prime is 21100211220989. The next prime is 21100211221009. The reversal of 21100211221004 is 40012211200112.

It is a super-2 number, since 2×21100211221004² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100211221009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27190993454 + ... + 27190994229.

It is an arithmetic number, because the mean of its divisors is an integer number (3108836962602).

Almost surely, 2^{21100211221004} is an apocalyptic number.

It is an amenable number.

21100211221004 is a deficient number, since it is larger than the sum of its proper divisors (16205832330220).

21100211221004 is a wasteful number, since it uses less digits than its factorization.

21100211221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54381987784 (or 54381987782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21100211221004 its reverse (40012211200112), we get a palindrome (61112422421116).

The spelling of 21100211221004 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, two hundred twenty-one thousand, four".