21210010033 has 8 divisors (see below), whose sum is σ = 22528507752. Its totient is φ = 19899384576.

The previous prime is 21210009959. The next prime is 21210010039. The reversal of 21210010033 is 33001001212.

It can be written as a sum of positive squares in 4 ways, for example, as 368179344 + 20841830689 = 19188^2 + 144367^2 .

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 21210010033 - 2²¹ = 21207912881 is a prime.

It is a super-2 number, since 2×21210010033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210009995 and 21210010022.

It is not an unprimeable number, because it can be changed into a prime (21210010039) 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, 1962510 + ... + 1973287.

It is an arithmetic number, because the mean of its divisors is an integer number (2816063469).

Almost surely, 2^21210010033 is an apocalyptic number.

It is an amenable number.

21210010033 is a deficient number, since it is larger than the sum of its proper divisors (1318497719).

21210010033 is a wasteful number, since it uses less digits than its factorization.

21210010033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936131.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21210010033 its reverse (33001001212), we get a palindrome (54211011245).

The spelling of 21210010033 in words is "twenty-one billion, two hundred ten million, ten thousand, thirty-three".