21212223033 has 8 divisors (see below), whose sum is σ = 28291807008. Its totient is φ = 14137060544.

The previous prime is 21212223017. The next prime is 21212223061. The reversal of 21212223033 is 33032221212.

It is a happy number.

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 21212223033 - 2⁴ = 21212223017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212223073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094160 + ... + 1113377.

It is an arithmetic number, because the mean of its divisors is an integer number (3536475876).

Almost surely, 2^21212223033 is an apocalyptic number.

It is an amenable number.

21212223033 is a deficient number, since it is larger than the sum of its proper divisors (7079583975).

21212223033 is a wasteful number, since it uses less digits than its factorization.

21212223033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210743.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21212223033 its reverse (33032221212), we get a palindrome (54244444245).

The spelling of 21212223033 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-three thousand, thirty-three".