21403622 has 4 divisors (see below), whose sum is σ = 32105436. Its totient is φ = 10701810.

The previous prime is 21403621. The next prime is 21403643. The reversal of 21403622 is 22630412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21403594 and 21403603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350904 + ... + 5350907.

It is an arithmetic number, because the mean of its divisors is an integer number (8026359).

Almost surely, 2^21403622 is an apocalyptic number.

21403622 is a deficient number, since it is larger than the sum of its proper divisors (10701814).

21403622 is a wasteful number, since it uses less digits than its factorization.

21403622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10701813.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21403622 is about 4626.4048677132. The cubic root of 21403622 is about 277.6487723218.

The spelling of 21403622 in words is "twenty-one million, four hundred three thousand, six hundred twenty-two".