21110311321045 has 8 divisors (see below), whose sum is σ = 26822513208024. Its totient is φ = 15894822641664.

The previous prime is 21110311321027. The next prime is 21110311321093. The reversal of 21110311321045 is 54012311301112.

It can be written as a sum of positive squares in 4 ways, for example, as 4267306536516 + 16843004784529 = 2065746^2 + 4104023^2 .

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 21110311321045 - 2²¹ = 21110309223893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124178301804 + ... + 124178301973.

It is an arithmetic number, because the mean of its divisors is an integer number (3352814151003).

Almost surely, 2^{21110311321045} is an apocalyptic number.

It is an amenable number.

21110311321045 is a deficient number, since it is larger than the sum of its proper divisors (5712201886979).

21110311321045 is a wasteful number, since it uses less digits than its factorization.

21110311321045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248356603799.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 21110311321045 its reverse (54012311301112), we get a palindrome (75122622622157).

The spelling of 21110311321045 in words is "twenty-one trillion, one hundred ten billion, three hundred eleven million, three hundred twenty-one thousand, forty-five".