21003122101 has 24 divisors (see below), whose sum is σ = 24062274720. Its totient is φ = 18273318336.

The previous prime is 21003122069. The next prime is 21003122159. The reversal of 21003122101 is 10122130012.

It is not a de Polignac number, because 21003122101 - 2⁵ = 21003122069 is a prime.

It is a super-2 number, since 2×21003122101² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003122171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615966 + ... + 649168.

It is an arithmetic number, because the mean of its divisors is an integer number (1002594780).

Almost surely, 2^21003122101 is an apocalyptic number.

It is an amenable number.

21003122101 is a deficient number, since it is larger than the sum of its proper divisors (3059152619).

21003122101 is a wasteful number, since it uses less digits than its factorization.

21003122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33445 (or 33432 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21003122101 its reverse (10122130012), we get a palindrome (31125252113).

The spelling of 21003122101 in words is "twenty-one billion, three million, one hundred twenty-two thousand, one hundred one".