21366422 has 24 divisors (see below), whose sum is σ = 40263888. Its totient is φ = 8323920.

The previous prime is 21366407. The next prime is 21366463. The reversal of 21366422 is 22466312.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21366391 and 21366400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4613 + ... + 8000.

It is an arithmetic number, because the mean of its divisors is an integer number (1677662).

Almost surely, 2^21366422 is an apocalyptic number.

21366422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21366422 is a deficient number, since it is larger than the sum of its proper divisors (18897466).

21366422 is a wasteful number, since it uses less digits than its factorization.

21366422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12644 (or 12633 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 21366422 is about 4622.3827189016. The cubic root of 21366422 is about 277.4878256705.

It can be divided in two parts, 2136 and 6422, that added together give a palindrome (8558).

The spelling of 21366422 in words is "twenty-one million, three hundred sixty-six thousand, four hundred twenty-two".