21000011122 has 16 divisors (see below), whose sum is σ = 31568103000. Its totient is φ = 10477336320.

The previous prime is 21000011089. The next prime is 21000011147. The reversal of 21000011122 is 22111000012.

It can be written as a sum of positive squares in 4 ways, for example, as 12571118641 + 8428892481 = 112121^2 + 91809^2 .

It is a super-3 number, since 3×21000011122³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000011099 and 21000011108.

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, 1878004 + ... + 1889152.

Almost surely, 2^21000011122 is an apocalyptic number.

21000011122 is a deficient number, since it is larger than the sum of its proper divisors (10568091878).

21000011122 is a wasteful number, since it uses less digits than its factorization.

21000011122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13101.

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

Adding to 21000011122 its reverse (22111000012), we get a palindrome (43111011134).

It can be divided in two parts, 210000 and 11122, that added together give a palindrome (221122).

The spelling of 21000011122 in words is "twenty-one billion, eleven thousand, one hundred twenty-two".