22121529 has 16 divisors (see below), whose sum is σ = 31375680. Its totient is φ = 13824000.

The previous prime is 22121521. The next prime is 22121531. The reversal of 22121529 is 92512122.

It is not a de Polignac number, because 22121529 - 2³ = 22121521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121499 and 22121508.

It is not an unprimeable number, because it can be changed into a prime (22121521) 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 15 ways as a sum of consecutive naturals, for example, 3529 + ... + 7529.

It is an arithmetic number, because the mean of its divisors is an integer number (1960980).

Almost surely, 2^22121529 is an apocalyptic number.

It is an amenable number.

22121529 is a deficient number, since it is larger than the sum of its proper divisors (9254151).

22121529 is a wasteful number, since it uses less digits than its factorization.

22121529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120.

The product of its digits is 720, while the sum is 24.

The square root of 22121529 is about 4703.3529529475. The cubic root of 22121529 is about 280.7189390086.

It can be divided in two parts, 2212 and 1529, that added together give a triangular number (3741 = T₈₆).

The spelling of 22121529 in words is "twenty-two million, one hundred twenty-one thousand, five hundred twenty-nine".