21350572 has 12 divisors (see below), whose sum is σ = 39561480. Its totient is φ = 10047296.

The previous prime is 21350551. The next prime is 21350597. The reversal of 21350572 is 27505312.

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, 156922 + ... + 157057.

It is an arithmetic number, because the mean of its divisors is an integer number (3296790).

Almost surely, 2^21350572 is an apocalyptic number.

It is an amenable number.

21350572 is a deficient number, since it is larger than the sum of its proper divisors (18210908).

21350572 is a wasteful number, since it uses less digits than its factorization.

21350572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314000 (or 313998 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21350572 is about 4620.6679170873. The cubic root of 21350572 is about 277.4191935268.

Adding to 21350572 its reverse (27505312), we get a palindrome (48855884).

The spelling of 21350572 in words is "twenty-one million, three hundred fifty thousand, five hundred seventy-two".