21121514 has 16 divisors (see below), whose sum is σ = 34328448. Its totient is φ = 9707712.

The previous prime is 21121511. The next prime is 21121537. The reversal of 21121514 is 41512112.

It is a super-2 number, since 2×21121514² = 892236707304392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21121492 and 21121501.

It is not an unprimeable number, because it can be changed into a prime (21121511) 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, 5762 + ... + 8685.

It is an arithmetic number, because the mean of its divisors is an integer number (2145528).

Almost surely, 2^21121514 is an apocalyptic number.

21121514 is a deficient number, since it is larger than the sum of its proper divisors (13206934).

21121514 is a wasteful number, since it uses less digits than its factorization.

21121514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14509.

The product of its digits is 80, while the sum is 17.

The square root of 21121514 is about 4595.8148352604. The cubic root of 21121514 is about 276.4235340810.

Adding to 21121514 its reverse (41512112), we get a palindrome (62633626).

The spelling of 21121514 in words is "twenty-one million, one hundred twenty-one thousand, five hundred fourteen".