21053522 has 8 divisors (see below), whose sum is σ = 36091776. Its totient is φ = 9022932.

The previous prime is 21053521. The next prime is 21053537. The reversal of 21053522 is 22535012.

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 = 21053494 and 21053503.

It is not an unprimeable number, because it can be changed into a prime (21053521) 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 3 ways as a sum of consecutive naturals, for example, 751898 + ... + 751925.

It is an arithmetic number, because the mean of its divisors is an integer number (4511472).

Almost surely, 2^21053522 is an apocalyptic number.

21053522 is a deficient number, since it is larger than the sum of its proper divisors (15038254).

21053522 is a wasteful number, since it uses less digits than its factorization.

21053522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503832.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21053522 is about 4588.4117077699. The cubic root of 21053522 is about 276.1266047318.

Adding to 21053522 its reverse (22535012), we get a palindrome (43588534).

It can be divided in two parts, 2105352 and 2, that multiplied together give a square (4210704 = 2052²).

The spelling of 21053522 in words is "twenty-one million, fifty-three thousand, five hundred twenty-two".