21500003213033 has 4 divisors (see below), whose sum is σ = 22193551703808. Its totient is φ = 20806454722260.

The previous prime is 21500003213011. The next prime is 21500003213053. The reversal of 21500003213033 is 33031230000512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21500003213033 - 2¹⁸ = 21500002950889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500003213053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346774245341 + ... + 346774245402.

It is an arithmetic number, because the mean of its divisors is an integer number (5548387925952).

Almost surely, 2^{21500003213033} is an apocalyptic number.

It is an amenable number.

21500003213033 is a deficient number, since it is larger than the sum of its proper divisors (693548490775).

21500003213033 is an equidigital number, since it uses as much as digits as its factorization.

21500003213033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693548490774.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 21500003213033 its reverse (33031230000512), we get a palindrome (54531233213545).

The spelling of 21500003213033 in words is "twenty-one trillion, five hundred billion, three million, two hundred thirteen thousand, thirty-three".