21111231220321 has 8 divisors (see below), whose sum is σ = 23030561808000. Its totient is φ = 19191921924240.

The previous prime is 21111231220307. The next prime is 21111231220357. The reversal of 21111231220321 is 12302213211112.

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 21111231220321 - 2³⁷ = 20973792266849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111231220292 and 21111231220301.

It is not an unprimeable number, because it can be changed into a prime (21111231220021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3213346 + ... + 7249003.

It is an arithmetic number, because the mean of its divisors is an integer number (2878820226000).

Almost surely, 2^{21111231220321} is an apocalyptic number.

It is an amenable number.

21111231220321 is a deficient number, since it is larger than the sum of its proper divisors (1919330587679).

21111231220321 is a wasteful number, since it uses less digits than its factorization.

21111231220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10645799.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21111231220321 its reverse (12302213211112), we get a palindrome (33413444431433).

The spelling of 21111231220321 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty-one million, two hundred twenty thousand, three hundred twenty-one".