21101220301 has 12 divisors (see below), whose sum is σ = 25990219548. Its totient is φ = 17022832512.

The previous prime is 21101220299. The next prime is 21101220311. The reversal of 21101220301 is 10302210112.

It can be written as a sum of positive squares in 2 ways, for example, as 10430536900 + 10670683401 = 102130^2 + 103299^2 .

It is not a de Polignac number, because 21101220301 - 2¹ = 21101220299 is a prime.

It is a super-2 number, since 2×21101220301² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101220311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12664966 + ... + 12666631.

It is an arithmetic number, because the mean of its divisors is an integer number (2165851629).

Almost surely, 2^21101220301 is an apocalyptic number.

It is an amenable number.

21101220301 is a deficient number, since it is larger than the sum of its proper divisors (4888999247).

21101220301 is a wasteful number, since it uses less digits than its factorization.

21101220301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25331628 (or 25331621 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21101220301 its reverse (10302210112), we get a palindrome (31403430413).

The spelling of 21101220301 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, three hundred one".