21121312301 has 4 divisors (see below), whose sum is σ = 21180146400. Its totient is φ = 21062478204.

The previous prime is 21121312283. The next prime is 21121312307. The reversal of 21121312301 is 10321312112.

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 21121312301 - 2³⁴ = 3941443117 is a prime.

It is a super-2 number, since 2×21121312301² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121312301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121312307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29416511 + ... + 29417228.

It is an arithmetic number, because the mean of its divisors is an integer number (5295036600).

Almost surely, 2^21121312301 is an apocalyptic number.

It is an amenable number.

21121312301 is a deficient number, since it is larger than the sum of its proper divisors (58834099).

21121312301 is an equidigital number, since it uses as much as digits as its factorization.

21121312301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58834098.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21121312301 its reverse (10321312112), we get a palindrome (31442624413).

The spelling of 21121312301 in words is "twenty-one billion, one hundred twenty-one million, three hundred twelve thousand, three hundred one".