21011122 has 8 divisors (see below), whose sum is σ = 34381872. Its totient is φ = 9550500.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011122 is 22111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21011099 and 21011108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477504 + ... + 477547.

It is an arithmetic number, because the mean of its divisors is an integer number (4297734).

Almost surely, 2^21011122 is an apocalyptic number.

21011122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011122 is a deficient number, since it is larger than the sum of its proper divisors (13370750).

21011122 is a wasteful number, since it uses less digits than its factorization.

21011122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955064.

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

The square root of 21011122 is about 4583.7890440115. The cubic root of 21011122 is about 275.9411150019.

Adding to 21011122 its reverse (22111012), we get a palindrome (43122134).

It can be divided in two parts, 2101 and 1122, that added together give a palindrome (3223).

The spelling of 21011122 in words is "twenty-one million, eleven thousand, one hundred twenty-two".