21673622 has 4 divisors (see below), whose sum is σ = 32510436. Its totient is φ = 10836810.

The previous prime is 21673577. The next prime is 21673633. The reversal of 21673622 is 22637612.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5418404 + ... + 5418407.

It is an arithmetic number, because the mean of its divisors is an integer number (8127609).

Almost surely, 2^21673622 is an apocalyptic number.

21673622 is a deficient number, since it is larger than the sum of its proper divisors (10836814).

21673622 is a wasteful number, since it uses less digits than its factorization.

21673622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836813.

The product of its digits is 6048, while the sum is 29.

The square root of 21673622 is about 4655.4937439546. The cubic root of 21673622 is about 278.8113814433.

It can be divided in two parts, 2167362 and 2, that multiplied together give a square (4334724 = 2082²).

The spelling of 21673622 in words is "twenty-one million, six hundred seventy-three thousand, six hundred twenty-two".