21422032 has 10 divisors (see below), whose sum is σ = 41505218. Its totient is φ = 10711008.

The previous prime is 21422029. The next prime is 21422053. The reversal of 21422032 is 23022412.

It can be written as a sum of positive squares in only one way, i.e., 12988816 + 8433216 = 3604^2 + 2904^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1338877 = 21422032 / (2 + 1 + 4 + 2 + 2 + 0 + 3 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21421997 and 21422015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669423 + ... + 669454.

Almost surely, 2^21422032 is an apocalyptic number.

It is an amenable number.

21422032 is a deficient number, since it is larger than the sum of its proper divisors (20083186).

21422032 is a wasteful number, since it uses less digits than its factorization.

21422032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338885 (or 1338879 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21422032 is about 4628.3941059508. The cubic root of 21422032 is about 277.7283546322.

Adding to 21422032 its reverse (23022412), we get a palindrome (44444444).

The spelling of 21422032 in words is "twenty-one million, four hundred twenty-two thousand, thirty-two".