21120211321001 has 8 divisors (see below), whose sum is σ = 22744881723144. Its totient is φ = 19495546456320.

The previous prime is 21120211320917. The next prime is 21120211321039. The reversal of 21120211321001 is 10012311202112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3208656025 + 21117002664976 = 56645^2 + 4595324^2 .

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 21120211321001 - 2³⁸ = 20845333414057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120211521001) 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, 10011761 + ... + 11936321.

It is an arithmetic number, because the mean of its divisors is an integer number (2843110215393).

Almost surely, 2^{21120211321001} is an apocalyptic number.

It is an amenable number.

21120211321001 is a deficient number, since it is larger than the sum of its proper divisors (1624670402143).

21120211321001 is a wasteful number, since it uses less digits than its factorization.

21120211321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768731.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21120211321001 its reverse (10012311202112), we get a palindrome (31132522523113).

The spelling of 21120211321001 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, three hundred twenty-one thousand, one".