21220031006 has 8 divisors (see below), whose sum is σ = 33702402240. Its totient is φ = 9985896928.

The previous prime is 21220030991. The next prime is 21220031009. The reversal of 21220031006 is 60013002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220031009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312059246 + ... + 312059313.

It is an arithmetic number, because the mean of its divisors is an integer number (4212800280).

Almost surely, 2^21220031006 is an apocalyptic number.

21220031006 is a deficient number, since it is larger than the sum of its proper divisors (12482371234).

21220031006 is a wasteful number, since it uses less digits than its factorization.

21220031006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624118578.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220031006 its reverse (60013002212), we get a palindrome (81233033218).

The spelling of 21220031006 in words is "twenty-one billion, two hundred twenty million, thirty-one thousand, six".