21230040101 has 4 divisors (see below), whose sum is σ = 21231009900. Its totient is φ = 21229070304.

The previous prime is 21230040049. The next prime is 21230040103. The reversal of 21230040101 is 10104003212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14136021025 + 7094019076 = 118895^2 + 84226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230040101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230040103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451286 + ... + 496103.

It is an arithmetic number, because the mean of its divisors is an integer number (5307752475).

Almost surely, 2^21230040101 is an apocalyptic number.

It is an amenable number.

21230040101 is a deficient number, since it is larger than the sum of its proper divisors (969799).

21230040101 is an equidigital number, since it uses as much as digits as its factorization.

21230040101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969798.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21230040101 its reverse (10104003212), we get a palindrome (31334043313).

The spelling of 21230040101 in words is "twenty-one billion, two hundred thirty million, forty thousand, one hundred one".