21535622 has 4 divisors (see below), whose sum is σ = 32303436. Its totient is φ = 10767810.

The previous prime is 21535621. The next prime is 21535639. The reversal of 21535622 is 22653512.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21535591 and 21535600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535621) 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 as a sum of consecutive naturals, namely, 5383904 + ... + 5383907.

It is an arithmetic number, because the mean of its divisors is an integer number (8075859).

Almost surely, 2^21535622 is an apocalyptic number.

21535622 is a deficient number, since it is larger than the sum of its proper divisors (10767814).

21535622 is a wasteful number, since it uses less digits than its factorization.

21535622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10767813.

The product of its digits is 3600, while the sum is 26.

The square root of 21535622 is about 4640.6488770430. The cubic root of 21535622 is about 278.2183730087.

The spelling of 21535622 in words is "twenty-one million, five hundred thirty-five thousand, six hundred twenty-two".