21301101 has 6 divisors (see below), whose sum is σ = 30768270. Its totient is φ = 14200728.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301101 is 10110312.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 1320201 = 4470^2 + 1149^2 .

It is not a de Polignac number, because 21301101 - 2² = 21301097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2366789 = 21301101 / (2 + 1 + 3 + 0 + 1 + 1 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183386 + ... + 1183403.

It is an arithmetic number, because the mean of its divisors is an integer number (5128045).

Almost surely, 2^21301101 is an apocalyptic number.

It is an amenable number.

21301101 is a deficient number, since it is larger than the sum of its proper divisors (9467169).

21301101 is a wasteful number, since it uses less digits than its factorization.

21301101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366795 (or 2366792 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21301101 is about 4615.3115821145. The cubic root of 21301101 is about 277.2047602613.

Adding to 21301101 its reverse (10110312), we get a palindrome (31411413).

The spelling of 21301101 in words is "twenty-one million, three hundred one thousand, one hundred one".