21297622 has 4 divisors (see below), whose sum is σ = 31946436. Its totient is φ = 10648810.

The previous prime is 21297569. The next prime is 21297631. The reversal of 21297622 is 22679212.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5324404 + ... + 5324407.

It is an arithmetic number, because the mean of its divisors is an integer number (7986609).

Almost surely, 2^21297622 is an apocalyptic number.

21297622 is a deficient number, since it is larger than the sum of its proper divisors (10648814).

21297622 is a wasteful number, since it uses less digits than its factorization.

21297622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10648813.

The product of its digits is 6048, while the sum is 31.

The square root of 21297622 is about 4614.9346690934. The cubic root of 21297622 is about 277.1896679606.

It can be divided in two parts, 2129762 and 2, that multiplied together give a palindrome (4259524).

The spelling of 21297622 in words is "twenty-one million, two hundred ninety-seven thousand, six hundred twenty-two".