21071022 has 16 divisors (see below), whose sum is σ = 48162432. Its totient is φ = 6020280.

The previous prime is 21071021. The next prime is 21071033. The reversal of 21071022 is 22017012.

It is a junction number, because it is equal to n+sod(n) for n = 21070992 and 21071010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250804 + ... + 250887.

It is an arithmetic number, because the mean of its divisors is an integer number (3010152).

Almost surely, 2^21071022 is an apocalyptic number.

21071022 is an abundant number, since it is smaller than the sum of its proper divisors (27091410).

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

21071022 is a wasteful number, since it uses less digits than its factorization.

21071022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501703.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21071022 is about 4590.3182896178. The cubic root of 21071022 is about 276.2030903880.

Adding to 21071022 its reverse (22017012), we get a palindrome (43088034).

The spelling of 21071022 in words is "twenty-one million, seventy-one thousand, twenty-two".