21011221301 has 4 divisors (see below), whose sum is σ = 24012824352. Its totient is φ = 18009618252.

The previous prime is 21011221291. The next prime is 21011221351. The reversal of 21011221301 is 10312211012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011221301 - 2¹⁴ = 21011204917 is a prime.

It is a super-3 number, since 3×21011221301³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011221351) 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 3 ways as a sum of consecutive naturals, for example, 1500801515 + ... + 1500801528.

It is an arithmetic number, because the mean of its divisors is an integer number (6003206088).

Almost surely, 2^21011221301 is an apocalyptic number.

It is an amenable number.

21011221301 is a deficient number, since it is larger than the sum of its proper divisors (3001603051).

21011221301 is an equidigital number, since it uses as much as digits as its factorization.

21011221301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001603050.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21011221301 its reverse (10312211012), we get a palindrome (31323432313).

The spelling of 21011221301 in words is "twenty-one billion, eleven million, two hundred twenty-one thousand, three hundred one".