21100202121122 has 32 divisors (see below), whose sum is σ = 33555225680640. Its totient is φ = 9916726570240.

The previous prime is 21100202121121. The next prime is 21100202121133. The reversal of 21100202121122 is 22112120200112.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21100202121122.

It is not an unprimeable number, because it can be changed into a prime (21100202121121) 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, 533069372 + ... + 533108952.

It is an arithmetic number, because the mean of its divisors is an integer number (1048600802520).

Almost surely, 2^{21100202121122} is an apocalyptic number.

21100202121122 is a deficient number, since it is larger than the sum of its proper divisors (12455023559518).

21100202121122 is a wasteful number, since it uses less digits than its factorization.

21100202121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59386.

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

Adding to 21100202121122 its reverse (22112120200112), we get a palindrome (43212322321234).

The spelling of 21100202121122 in words is "twenty-one trillion, one hundred billion, two hundred two million, one hundred twenty-one thousand, one hundred twenty-two".