21122121333 has 8 divisors (see below), whose sum is σ = 28168072128. Its totient is φ = 14078792384.

The previous prime is 21122121313. The next prime is 21122121341. The reversal of 21122121333 is 33312122112.

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 21122121333 - 2⁹ = 21122120821 is a prime.

It is a super-2 number, since 2×21122121333² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122121313) 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, 636585 + ... + 668942.

It is an arithmetic number, because the mean of its divisors is an integer number (3521009016).

Almost surely, 2^21122121333 is an apocalyptic number.

It is an amenable number.

21122121333 is a deficient number, since it is larger than the sum of its proper divisors (7045950795).

21122121333 is a wasteful number, since it uses less digits than its factorization.

21122121333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310923.

The product of its digits is 432, while the sum is 21.

Adding to 21122121333 its reverse (33312122112), we get a palindrome (54434243445).

The spelling of 21122121333 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, three hundred thirty-three".