21003333101021 has 8 divisors (see below), whose sum is σ = 22238963931384. Its totient is φ = 19767717898240.

The previous prime is 21003333100991. The next prime is 21003333101053. The reversal of 21003333101021 is 12010133330012.

It can be written as a sum of positive squares in 4 ways, for example, as 9967981298521 + 11035351802500 = 3157211^2 + 3321950^2 .

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 21003333101021 - 2³⁸ = 20728455194077 is a prime.

It is a super-2 number, since 2×21003333101021² (a number of 27 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 = 21003333100984 and 21003333101002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003333101081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081460 + ... + 6570861.

It is an arithmetic number, because the mean of its divisors is an integer number (2779870491423).

Almost surely, 2^{21003333101021} is an apocalyptic number.

It is an amenable number.

21003333101021 is a deficient number, since it is larger than the sum of its proper divisors (1235630830363).

21003333101021 is a wasteful number, since it uses less digits than its factorization.

21003333101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7813791.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21003333101021 its reverse (12010133330012), we get a palindrome (33013466431033).

The spelling of 21003333101021 in words is "twenty-one trillion, three billion, three hundred thirty-three million, one hundred one thousand, twenty-one".