21119121 has 12 divisors (see below), whose sum is σ = 31155072. Its totient is φ = 13779576.

The previous prime is 21119113. The next prime is 21119143. The reversal of 21119121 is 12191112.

It is a happy number.

It is not a de Polignac number, because 21119121 - 2³ = 21119113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21119094 and 21119103.

It is not an unprimeable number, because it can be changed into a prime (21119171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24541 + ... + 25386.

It is an arithmetic number, because the mean of its divisors is an integer number (2596256).

Almost surely, 2^21119121 is an apocalyptic number.

It is an amenable number.

21119121 is a deficient number, since it is larger than the sum of its proper divisors (10035951).

21119121 is a wasteful number, since it uses less digits than its factorization.

21119121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49980 (or 49977 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

The square root of 21119121 is about 4595.5544823231. The cubic root of 21119121 is about 276.4130943859.

The spelling of 21119121 in words is "twenty-one million, one hundred nineteen thousand, one hundred twenty-one".