21270022 has 4 divisors (see below), whose sum is σ = 31905036. Its totient is φ = 10635010.

The previous prime is 21270017. The next prime is 21270023. The reversal of 21270022 is 22007212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21269978 and 21270005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5317504 + ... + 5317507.

It is an arithmetic number, because the mean of its divisors is an integer number (7976259).

Almost surely, 2^21270022 is an apocalyptic number.

21270022 is a deficient number, since it is larger than the sum of its proper divisors (10635014).

21270022 is a wasteful number, since it uses less digits than its factorization.

21270022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635013.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21270022 is about 4611.9434081524. The cubic root of 21270022 is about 277.0698777167.

Adding to 21270022 its reverse (22007212), we get a palindrome (43277234).

The spelling of 21270022 in words is "twenty-one million, two hundred seventy thousand, twenty-two".