21421213121333 has 8 divisors (see below), whose sum is σ = 21521649800280. Its totient is φ = 21320836392960.

The previous prime is 21421213121263. The next prime is 21421213121353. The reversal of 21421213121333 is 33312131212412.

It can be written as a sum of positive squares in 4 ways, for example, as 692478615409 + 20728734505924 = 832153^2 + 4552882^2 .

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 21421213121333 - 2³⁴ = 21404033252149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21421213121296 and 21421213121305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421213121353) 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, 14271260 + ... + 15700677.

It is an arithmetic number, because the mean of its divisors is an integer number (2690206225035).

Almost surely, 2^{21421213121333} is an apocalyptic number.

It is an amenable number.

21421213121333 is a deficient number, since it is larger than the sum of its proper divisors (100436678947).

21421213121333 is a wasteful number, since it uses less digits than its factorization.

21421213121333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29975287.

The product of its digits is 5184, while the sum is 29.

Adding to 21421213121333 its reverse (33312131212412), we get a palindrome (54733344333745).

The spelling of 21421213121333 in words is "twenty-one trillion, four hundred twenty-one billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred thirty-three".