10231220021 has 8 divisors (see below), whose sum is σ = 11168062464. Its totient is φ = 9295499520.

The previous prime is 10231220017. The next prime is 10231220029. The reversal of 10231220021 is 12002213201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 10231220021 - 2² = 10231220017 is a prime.

It is a super-2 number, since 2×10231220021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10231219978 and 10231220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10231220029) 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, 261356 + ... + 297941.

It is an arithmetic number, because the mean of its divisors is an integer number (1396007808).

Almost surely, 2^10231220021 is an apocalyptic number.

10231220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10231220021 is a deficient number, since it is larger than the sum of its proper divisors (936842443).

10231220021 is a wasteful number, since it uses less digits than its factorization.

10231220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560971.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 10231220021 its reverse (12002213201), we get a palindrome (22233433222).

The spelling of 10231220021 in words is "ten billion, two hundred thirty-one million, two hundred twenty thousand, twenty-one".