21101122 has 16 divisors (see below), whose sum is σ = 36533952. Its totient is φ = 8953200.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101122 is 22110112.

It is a junction number, because it is equal to n+sod(n) for n = 21101099 and 21101108.

It is not an unprimeable number, because it can be changed into a prime (21101123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6048 + ... + 8875.

It is an arithmetic number, because the mean of its divisors is an integer number (2283372).

Almost surely, 2^21101122 is an apocalyptic number.

21101122 is a deficient number, since it is larger than the sum of its proper divisors (15432830).

21101122 is a wasteful number, since it uses less digits than its factorization.

21101122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15033.

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

The square root of 21101122 is about 4593.5957593154. The cubic root of 21101122 is about 276.3345467144.

Adding to 21101122 its reverse (22110112), we get a palindrome (43211234).

It can be divided in two parts, 2110112 and 2, that multiplied together give a palindrome (4220224).

The spelling of 21101122 in words is "twenty-one million, one hundred one thousand, one hundred twenty-two".