21650022 has 12 divisors (see below), whose sum is σ = 46908420. Its totient is φ = 7216668.

The previous prime is 21650021. The next prime is 21650087. The reversal of 21650022 is 22005612.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1202779 = 21650022 / (2 + 1 + 6 + 5 + 0 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21649977 and 21650004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601372 + ... + 601407.

It is an arithmetic number, because the mean of its divisors is an integer number (3909035).

Almost surely, 2^21650022 is an apocalyptic number.

21650022 is an abundant number, since it is smaller than the sum of its proper divisors (25258398).

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

21650022 is a wasteful number, since it uses less digits than its factorization.

21650022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202787 (or 1202784 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21650022 is about 4652.9584137407. The cubic root of 21650022 is about 278.7101471979.

Adding to 21650022 its reverse (22005612), we get a palindrome (43655634).

The spelling of 21650022 in words is "twenty-one million, six hundred fifty thousand, twenty-two".