21353622 has 32 divisors (see below), whose sum is σ = 43593984. Its totient is φ = 6972000.

The previous prime is 21353611. The next prime is 21353627. The reversal of 21353622 is 22635312.

It is a junction number, because it is equal to n+sod(n) for n = 21353592 and 21353601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101097 + ... + 101307.

It is an arithmetic number, because the mean of its divisors is an integer number (1362312).

Almost surely, 2^21353622 is an apocalyptic number.

21353622 is an abundant number, since it is smaller than the sum of its proper divisors (22240362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21353622 is a wasteful number, since it uses less digits than its factorization.

21353622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its digits is 2160, while the sum is 24.

The square root of 21353622 is about 4620.9979441675. The cubic root of 21353622 is about 277.4324029817.

Adding to 21353622 its reverse (22635312), we get a palindrome (43988934).

It can be divided in two parts, 2135362 and 2, that multiplied together give a palindrome (4270724).

The spelling of 21353622 in words is "twenty-one million, three hundred fifty-three thousand, six hundred twenty-two".