21333021211021 has 8 divisors (see below), whose sum is σ = 23100951148184. Its totient is φ = 19583223888960.

The previous prime is 21333021210979. The next prime is 21333021211049. The reversal of 21333021211021 is 12011212033312.

It can be written as a sum of positive squares in 4 ways, for example, as 271260900 + 21332749950121 = 16470^2 + 4618739^2 .

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 21333021211021 - 2²⁷ = 21332886993293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21333021210983 and 21333021211001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333021212021) 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, 4533151326 + ... + 4533156031.

It is an arithmetic number, because the mean of its divisors is an integer number (2887618893523).

Almost surely, 2^{21333021211021} is an apocalyptic number.

It is an amenable number.

21333021211021 is a deficient number, since it is larger than the sum of its proper divisors (1767929937163).

21333021211021 is a wasteful number, since it uses less digits than its factorization.

21333021211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066307551.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21333021211021 its reverse (12011212033312), we get a palindrome (33344233244333).

The spelling of 21333021211021 in words is "twenty-one trillion, three hundred thirty-three billion, twenty-one million, two hundred eleven thousand, twenty-one".