21301110601 has 3 divisors (see below), whose sum is σ = 21301256551. Its totient is φ = 21300964652.

The previous prime is 21301110599. The next prime is 21301110629. The reversal of 21301110601 is 10601110312.

The square root of 21301110601 is 145949.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 21286518201 + 14592400 = 145899^2 + 3820^2 .

It is not a de Polignac number, because 21301110601 - 2¹ = 21301110599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301110661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 72975 + ... + 218923.

Almost surely, 2^21301110601 is an apocalyptic number.

21301110601 is the 145949-th square number.

21301110601 is the 72975-th centered octagonal number.

It is an amenable number.

21301110601 is a deficient number, since it is larger than the sum of its proper divisors (145950).

21301110601 is an frugal number, since it uses more digits than its factorization.

21301110601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291898 (or 145949 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Multiplying 21301110601 by its sum of digits (16), we get a square (340817769616 = 583796²).

Multiplying 21301110601 by its product of nonzero digits (36), we get a square (766839981636 = 875694²).

Adding to 21301110601 its reverse (10601110312), we get a palindrome (31902220913).

The spelling of 21301110601 in words is "twenty-one billion, three hundred one million, one hundred ten thousand, six hundred one".