21520622 has 8 divisors (see below), whose sum is σ = 32474736. Its totient is φ = 10695712.

The previous prime is 21520607. The next prime is 21520637. The reversal of 21520622 is 22602512.

It is an interprime number because it is at equal distance from previous prime (21520607) and next prime (21520637).

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 = 21520594 and 21520603.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31883 + ... + 32550.

It is an arithmetic number, because the mean of its divisors is an integer number (4059342).

Almost surely, 2^21520622 is an apocalyptic number.

21520622 is a deficient number, since it is larger than the sum of its proper divisors (10954114).

21520622 is a wasteful number, since it uses less digits than its factorization.

21520622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64602.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21520622 is about 4639.0324422233. The cubic root of 21520622 is about 278.1537630818.

The spelling of 21520622 in words is "twenty-one million, five hundred twenty thousand, six hundred twenty-two".