20021022231 has 8 divisors (see below), whose sum is σ = 30508224384. Its totient is φ = 11440584120.

The previous prime is 20021022223. The next prime is 20021022239. The reversal of 20021022231 is 13222012002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20021022223) and next prime (20021022239).

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

It is not a de Polignac number, because 20021022231 - 2³ = 20021022223 is a prime.

It is a super-2 number, since 2×20021022231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20021022231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021022239) 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, 476690985 + ... + 476691026.

It is an arithmetic number, because the mean of its divisors is an integer number (3813528048).

Almost surely, 2^20021022231 is an apocalyptic number.

20021022231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20021022231 is a deficient number, since it is larger than the sum of its proper divisors (10487202153).

20021022231 is an equidigital number, since it uses as much as digits as its factorization.

20021022231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953382021.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20021022231 its reverse (13222012002), we get a palindrome (33243034233).

The spelling of 20021022231 in words is "twenty billion, twenty-one million, twenty-two thousand, two hundred thirty-one".