21211221301 has 8 divisors (see below), whose sum is σ = 21732792984. Its totient is φ = 20689850880.

The previous prime is 21211221277. The next prime is 21211221313. The reversal of 21211221301 is 10312211212.

It can be written as a sum of positive squares in 4 ways, for example, as 4532790276 + 16678431025 = 67326^2 + 129145^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211221301 - 2²⁷ = 21077003573 is a prime.

It is a super-2 number, since 2×21211221301² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211251301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175341 + ... + 270493.

It is an arithmetic number, because the mean of its divisors is an integer number (2716599123).

Almost surely, 2^21211221301 is an apocalyptic number.

It is an amenable number.

21211221301 is a deficient number, since it is larger than the sum of its proper divisors (521571683).

21211221301 is an equidigital number, since it uses as much as digits as its factorization.

21211221301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100631.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211221301 its reverse (10312211212), we get a palindrome (31523432513).

The spelling of 21211221301 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, three hundred one".