21123333201021 has 4 divisors (see below), whose sum is σ = 28164444268032. Its totient is φ = 14082222134012.

The previous prime is 21123333201017. The next prime is 21123333201067. The reversal of 21123333201021 is 12010233332112.

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 21123333201021 - 2² = 21123333201017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123333200982 and 21123333201000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123333201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520555533501 + ... + 3520555533506.

It is an arithmetic number, because the mean of its divisors is an integer number (7041111067008).

Almost surely, 2^{21123333201021} is an apocalyptic number.

It is an amenable number.

21123333201021 is a deficient number, since it is larger than the sum of its proper divisors (7041111067011).

21123333201021 is an equidigital number, since it uses as much as digits as its factorization.

21123333201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041111067010.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21123333201021 its reverse (12010233332112), we get a palindrome (33133566533133).

The spelling of 21123333201021 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirty-three million, two hundred one thousand, twenty-one".