21001000001122 has 16 divisors (see below), whose sum is σ = 31522157130240. Its totient is φ = 10493616545712.

The previous prime is 21001000001101. The next prime is 21001000001141. The reversal of 21001000001122 is 22110000010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001000001099 and 21001000001108.

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, 18170173 + ... + 19291375.

It is an arithmetic number, because the mean of its divisors is an integer number (1970134820640).

Almost surely, 2^{21001000001122} is an apocalyptic number.

21001000001122 is a deficient number, since it is larger than the sum of its proper divisors (10521157129118).

21001000001122 is a wasteful number, since it uses less digits than its factorization.

21001000001122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127337.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001000001122 its reverse (22110000010012), we get a palindrome (43111000011134).

The spelling of 21001000001122 in words is "twenty-one trillion, one billion, one thousand, one hundred twenty-two".