21031130101 has 4 divisors (see below), whose sum is σ = 21060793900. Its totient is φ = 21001466304.

The previous prime is 21031130089. The next prime is 21031130177. The reversal of 21031130101 is 10103113012.

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 1039998001 + 19991132100 = 32249^2 + 141390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031130101 - 2¹⁷ = 21030999029 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 (21031130401) 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, 14830836 + ... + 14832253.

It is an arithmetic number, because the mean of its divisors is an integer number (5265198475).

Almost surely, 2^21031130101 is an apocalyptic number.

It is an amenable number.

21031130101 is a deficient number, since it is larger than the sum of its proper divisors (29663799).

21031130101 is an equidigital number, since it uses as much as digits as its factorization.

21031130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29663798.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21031130101 its reverse (10103113012), we get a palindrome (31134243113).

The spelling of 21031130101 in words is "twenty-one billion, thirty-one million, one hundred thirty thousand, one hundred one".