21232001222021 has 4 divisors (see below), whose sum is σ = 21260731941600. Its totient is φ = 21203270502444.

The previous prime is 21232001221957. The next prime is 21232001222023. The reversal of 21232001222021 is 12022210023212.

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 21232001222021 - 2⁶ = 21232001221957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232001221984 and 21232001222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232001222023) 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, 14365358681 + ... + 14365360158.

It is an arithmetic number, because the mean of its divisors is an integer number (5315182985400).

Almost surely, 2^{21232001222021} is an apocalyptic number.

It is an amenable number.

21232001222021 is a deficient number, since it is larger than the sum of its proper divisors (28730719579).

21232001222021 is an equidigital number, since it uses as much as digits as its factorization.

21232001222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28730719578.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21232001222021 its reverse (12022210023212), we get a palindrome (33254211245233).

The spelling of 21232001222021 in words is "twenty-one trillion, two hundred thirty-two billion, one million, two hundred twenty-two thousand, twenty-one".