21030123101 has 16 divisors (see below), whose sum is σ = 22757293440. Its totient is φ = 19318728000.

The previous prime is 21030123097. The next prime is 21030123119. The reversal of 21030123101 is 10132103012.

It is not a de Polignac number, because 21030123101 - 2² = 21030123097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030123901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5652920 + ... + 5656638.

It is an arithmetic number, because the mean of its divisors is an integer number (1422330840).

Almost surely, 2^21030123101 is an apocalyptic number.

It is an amenable number.

21030123101 is a deficient number, since it is larger than the sum of its proper divisors (1727170339).

21030123101 is a wasteful number, since it uses less digits than its factorization.

21030123101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21030123101 its reverse (10132103012), we get a palindrome (31162226113).

The spelling of 21030123101 in words is "twenty-one billion, thirty million, one hundred twenty-three thousand, one hundred one".