21001101222122 has 16 divisors (see below), whose sum is σ = 36051003635712. Its totient is φ = 8988192995760.

The previous prime is 21001101222091. The next prime is 21001101222131. The reversal of 21001101222122 is 22122210110012.

It is a super-3 number, since 3×21001101222122³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21001101222122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023235754 + ... + 1023256277.

It is an arithmetic number, because the mean of its divisors is an integer number (2253187727232).

Almost surely, 2^{21001101222122} is an apocalyptic number.

21001101222122 is a deficient number, since it is larger than the sum of its proper divisors (15049902413590).

21001101222122 is a wasteful number, since it uses less digits than its factorization.

21001101222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046492773.

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

Adding to 21001101222122 its reverse (22122210110012), we get a palindrome (43123311332134).

The spelling of 21001101222122 in words is "twenty-one trillion, one billion, one hundred one million, two hundred twenty-two thousand, one hundred twenty-two".