21240121301 has 4 divisors (see below), whose sum is σ = 24274424352. Its totient is φ = 18205818252.

The previous prime is 21240121297. The next prime is 21240121339. The reversal of 21240121301 is 10312104212.

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 21240121301 - 2² = 21240121297 is a prime.

It is a super-2 number, since 2×21240121301² (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 21240121301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240121801) 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, 1517151515 + ... + 1517151528.

It is an arithmetic number, because the mean of its divisors is an integer number (6068606088).

Almost surely, 2^21240121301 is an apocalyptic number.

It is an amenable number.

21240121301 is a deficient number, since it is larger than the sum of its proper divisors (3034303051).

21240121301 is an equidigital number, since it uses as much as digits as its factorization.

21240121301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034303050.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21240121301 its reverse (10312104212), we get a palindrome (31552225513).

The spelling of 21240121301 in words is "twenty-one billion, two hundred forty million, one hundred twenty-one thousand, three hundred one".