21031022 has 16 divisors (see below), whose sum is σ = 32955120. Its totient is φ = 10055808.

The previous prime is 21031019. The next prime is 21031027. The reversal of 21031022 is 22013012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21030994 and 21031012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1958 + ... + 6774.

It is an arithmetic number, because the mean of its divisors is an integer number (2059695).

Almost surely, 2^21031022 is an apocalyptic number.

21031022 is a deficient number, since it is larger than the sum of its proper divisors (11924098).

21031022 is a wasteful number, since it uses less digits than its factorization.

21031022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21031022 is about 4585.9592235431. The cubic root of 21031022 is about 276.0282037271.

Adding to 21031022 its reverse (22013012), we get a palindrome (43044034).

It can be divided in two parts, 2103 and 1022, that added together give a 5-th power (3125 = 5⁵).

The spelling of 21031022 in words is "twenty-one million, thirty-one thousand, twenty-two".