21001211301 has 48 divisors (see below), whose sum is σ = 33610381056. Its totient is φ = 11623901184.

The previous prime is 21001211291. The next prime is 21001211311. The reversal of 21001211301 is 10311210012.

It is an interprime number because it is at equal distance from previous prime (21001211291) and next prime (21001211311).

It is not a de Polignac number, because 21001211301 - 2⁵ = 21001211269 is a prime.

It is a super-2 number, since 2×21001211301² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001211311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 654505 + ... + 685841.

It is an arithmetic number, because the mean of its divisors is an integer number (700216272).

Almost surely, 2^21001211301 is an apocalyptic number.

21001211301 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21001211301 is a deficient number, since it is larger than the sum of its proper divisors (12609169755).

21001211301 is a wasteful number, since it uses less digits than its factorization.

21001211301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31498 (or 31491 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21001211301 its reverse (10311210012), we get a palindrome (31312421313).

The spelling of 21001211301 in words is "twenty-one billion, one million, two hundred eleven thousand, three hundred one".