21020222033 has 8 divisors (see below), whose sum is σ = 22858238952. Its totient is φ = 19249042176.

The previous prime is 21020222029. The next prime is 21020222059. The reversal of 21020222033 is 33022202012.

It can be written as a sum of positive squares in 4 ways, for example, as 3909750784 + 17110471249 = 62528^2 + 130807^2 .

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 21020222033 - 2² = 21020222029 is a prime.

It is a super-3 number, since 3×21020222033³ (a number of 32 digits) contains 333 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020222833) 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, 16708610 + ... + 16709867.

It is an arithmetic number, because the mean of its divisors is an integer number (2857279869).

Almost surely, 2^21020222033 is an apocalyptic number.

It is an amenable number.

21020222033 is a deficient number, since it is larger than the sum of its proper divisors (1838016919).

21020222033 is a wasteful number, since it uses less digits than its factorization.

21020222033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33418531.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21020222033 its reverse (33022202012), we get a palindrome (54042424045).

The spelling of 21020222033 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, thirty-three".