21011201220122 has 32 divisors (see below), whose sum is σ = 32555630165184. Its totient is φ = 10163962972800.

The previous prime is 21011201220083. The next prime is 21011201220127. The reversal of 21011201220122 is 22102210211012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011201220122.

It is not an unprimeable number, because it can be changed into a prime (21011201220127) 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, 2600633 + ... + 6984675.

It is an arithmetic number, because the mean of its divisors is an integer number (1017363442662).

Almost surely, 2^{21011201220122} is an apocalyptic number.

21011201220122 is a deficient number, since it is larger than the sum of its proper divisors (11544428945062).

21011201220122 is a wasteful number, since it uses less digits than its factorization.

21011201220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384574.

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

Adding to 21011201220122 its reverse (22102210211012), we get a palindrome (43113411431134).

The spelling of 21011201220122 in words is "twenty-one trillion, eleven billion, two hundred one million, two hundred twenty thousand, one hundred twenty-two".