21103101000321 has 32 divisors (see below), whose sum is σ = 28921170216960. Its totient is φ = 13680749898816.

The previous prime is 21103101000313. The next prime is 21103101000361. The reversal of 21103101000321 is 12300010130112.

It is a happy number.

It is not a de Polignac number, because 21103101000321 - 2³ = 21103101000313 is a prime.

It is a super-4 number, since 4×21103101000321⁴ (a number of 54 digits) contains 4444 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103101000321.

It is not an unprimeable number, because it can be changed into a prime (21103101000361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474130150 + ... + 474174656.

It is an arithmetic number, because the mean of its divisors is an integer number (903786569280).

Almost surely, 2^{21103101000321} is an apocalyptic number.

It is an amenable number.

21103101000321 is a deficient number, since it is larger than the sum of its proper divisors (7818069216639).

21103101000321 is a wasteful number, since it uses less digits than its factorization.

21103101000321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66133.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21103101000321 its reverse (12300010130112), we get a palindrome (33403111130433).

The spelling of 21103101000321 in words is "twenty-one trillion, one hundred three billion, one hundred one million, three hundred twenty-one", and thus it is an aban number.