21797446 has 16 divisors (see below), whose sum is σ = 37546560. Its totient is φ = 9386280.

The previous prime is 21797437. The next prime is 21797449. The reversal of 21797446 is 64479712.

It is a junction number, because it is equal to n+sod(n) for n = 21797399 and 21797408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21797449) 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 7 ways as a sum of consecutive naturals, for example, 25656 + ... + 26491.

It is an arithmetic number, because the mean of its divisors is an integer number (2346660).

Almost surely, 2^21797446 is an apocalyptic number.

21797446 is a deficient number, since it is larger than the sum of its proper divisors (15749114).

21797446 is a wasteful number, since it uses less digits than its factorization.

21797446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52179.

The product of its digits is 84672, while the sum is 40.

The square root of 21797446 is about 4668.7735006102. The cubic root of 21797446 is about 279.3413344383.

The spelling of 21797446 in words is "twenty-one million, seven hundred ninety-seven thousand, four hundred forty-six".