21362620 has 12 divisors (see below), whose sum is σ = 44861544. Its totient is φ = 8545040.

The previous prime is 21362609. The next prime is 21362629. The reversal of 21362620 is 2626312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21362591 and 21362600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534046 + ... + 534085.

It is an arithmetic number, because the mean of its divisors is an integer number (3738462).

Almost surely, 2^21362620 is an apocalyptic number.

21362620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21362620 is an abundant number, since it is smaller than the sum of its proper divisors (23498924).

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

21362620 is a wasteful number, since it uses less digits than its factorization.

21362620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068140 (or 1068138 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21362620 is about 4621.9714408464. The cubic root of 21362620 is about 277.4713657114.

Adding to 21362620 its reverse (2626312), we get a palindrome (23988932).

The spelling of 21362620 in words is "twenty-one million, three hundred sixty-two thousand, six hundred twenty".