21103333023221 has 4 divisors (see below), whose sum is σ = 21139284187392. Its totient is φ = 21067381859052.

The previous prime is 21103333023211. The next prime is 21103333023233. The reversal of 21103333023221 is 12232033330112.

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 a de Polignac number, because none of the positive numbers 2^k-21103333023221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103333023211) 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, 17975581205 + ... + 17975582378.

It is an arithmetic number, because the mean of its divisors is an integer number (5284821046848).

Almost surely, 2^{21103333023221} is an apocalyptic number.

It is an amenable number.

21103333023221 is a deficient number, since it is larger than the sum of its proper divisors (35951164171).

21103333023221 is an equidigital number, since it uses as much as digits as its factorization.

21103333023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35951164170.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21103333023221 its reverse (12232033330112), we get a palindrome (33335366353333).

The spelling of 21103333023221 in words is "twenty-one trillion, one hundred three billion, three hundred thirty-three million, twenty-three thousand, two hundred twenty-one".