21202121341 has 4 divisors (see below), whose sum is σ = 21214259392. Its totient is φ = 21189983292.

The previous prime is 21202121329. The next prime is 21202121371. The reversal of 21202121341 is 14312120212.

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 21202121341 - 2¹¹ = 21202119293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202121371) 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, 6066405 + ... + 6069898.

It is an arithmetic number, because the mean of its divisors is an integer number (5303564848).

Almost surely, 2^21202121341 is an apocalyptic number.

It is an amenable number.

21202121341 is a deficient number, since it is larger than the sum of its proper divisors (12138051).

21202121341 is a wasteful number, since it uses less digits than its factorization.

21202121341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12138050.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21202121341 its reverse (14312120212), we get a palindrome (35514241553).

The spelling of 21202121341 in words is "twenty-one billion, two hundred two million, one hundred twenty-one thousand, three hundred forty-one".